locking: Remove README file in favor of internals/locking.html

The README file seems to be a leftover from some previous version of
locking driver. It is not consistent with what the code does nor is it
consistent with existing documentation in internals/locking.html.

src/locking/README

-       Using the Lock Manager APIs
-       ===========================
-
-This file describes how to use the lock manager APIs.
-All the guest lifecycle sequences here have higher
-level wrappers provided by the 'domain_lock.h' API,
-which simplify thue usage
-
-At libvirtd startup:
-
-  plugin = virLockManagerPluginLoad("sync-manager");
-
-
-At libvirtd shtudown:
-
-  virLockManagerPluginUnload(plugin)
-
-
-At guest startup:
-
-  manager = virLockManagerNew(plugin,
-                              VIR_LOCK_MANAGER_OBJECT_DOMAIN,
-                              0);
-
-  virLockManagerSetParameter(manager, "id", id);
-  virLockManagerSetParameter(manager, "uuid", uuid);
-  virLockManagerSetParameter(manager, "name", name);
-
-  foreach disk
-    virLockManagerRegisterResource(manager,
-                                   VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK,
-                                   disk.path,
-                                   ..flags...);
-
-  if (!virLockManagerAcquireObject(manager))
-    abort..
-
-  run QEMU
-
-
-At guest shutdown:
-
-  ...send QEMU 'quit' monitor command, and/or kill(qemupid)...
-
-  if (!virLockManagerShutdown(manager))
-     kill(supervisorpid); /* XXX or leave it running ??? */
-
-  virLockManagerFree(manager);
-
-
-
-At libvirtd restart with running guests:
-
-  foreach still running guest
-    manager = virLockManagerNew(driver,
-                                VIR_LOCK_MANAGER_START_DOMAIN,
-                                VIR_LOCK_MANAGER_NEW_ATTACH);
-    virLockManagerSetParameter(manager, "id", id);
-    virLockManagerSetParameter(manager, "uuid", uuid);
-    virLockManagerSetParameter(manager, "name", name);
-
-    if (!virLockManagerGetChild(manager, &qemupid))
-      kill(supervisorpid); /* XXX or leave it running ??? */
-
-
-
-With disk hotplug:
-
-  if (virLockManagerAcquireResource(manager,
-                                    VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK,
-                                    disk.path
-                                    ..flags..))
-     ...abort hotplug attempt ...
-
-  ...hotplug the device...
-
-
-
-With disk unhotplug:
-
-    ...hotunplug the device...
-
-  if (virLockManagerReleaseResource(manager,
-                                    VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK,
-                                    disk.path
-                                    ..flags..))
-     ...log warning ...
-
-
-
-During migration:
-
-  1. On source host
-
-       if (!virLockManagerPrepareMigrate(manager, hosturi))
-           ..don't start migration..
-
-  2. On dest host
-
-      manager = virLockManagerNew(driver,
-                                  VIR_LOCK_MANAGER_START_DOMAIN,
-                                  VIR_LOCK_MANAGER_NEW_MIGRATE);
-      virLockManagerSetParameter(manager, "id", id);
-      virLockManagerSetParameter(manager, "uuid", uuid);
-      virLockManagerSetParameter(manager, "name", name);
-
-      foreach disk
-        virLockManagerRegisterResource(manager,
-                                       VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK,
-                                       disk.path,
-                                       ..flags...);
-
-      char **supervisorargv;
-      int supervisorargc;
-
-      supervisor = virLockManagerGetSupervisorPath(manager);
-      virLockManagerGetSupervisorArgs(&argv, &argc);
-
-      cmd = qemuBuildCommandLine(supervisor, supervisorargv, supervisorargv);
-
-      supervisorpid = virCommandExec(cmd);
-
-      if (!virLockManagerGetChild(manager, &qemupid))
-        kill(supervisorpid); /* XXX or leave it running ??? */
-
-  3. Initiate migration in QEMU on source and wait for completion
-
-  4a. On failure
-
-      4a1 On target
-
-            virLockManagerCompleteMigrateIn(manager,
-                                            VIR_LOCK_MANAGER_MIGRATE_CANCEL);
-            virLockManagerShutdown(manager);
-            virLockManagerFree(manager);
-
-      4a2 On source
-
-            virLockManagerCompleteMigrateIn(manager,
-                                            VIR_LOCK_MANAGER_MIGRATE_CANCEL);
-
-  4b. On succcess
-
-
-      4b1 On target
-
-            virLockManagerCompleteMigrateIn(manager, 0);
-
-      42 On source
-
-            virLockManagerCompleteMigrateIn(manager, 0);
-            virLockManagerShutdown(manager);
-            virLockManagerFree(manager);
-
-
-Notes:
-
-  - If a lock manager impl does just VM level leases, it can
-    ignore all the resource paths at startup.
-
-  - If a lock manager impl does not support migrate
-    it can return an error from all migrate calls
-
-  - If a lock manger impl does not support hotplug
-    it can return an error from all resource acquire/release calls