This patch refactors the initialization and cleanup path of dnode
with a table driven method. This fixes the following issues:

1. Before the patch, if dnodeInitRead() fails, the cleanup path
also runs dnodeCleanupWrite(), which will free wWorkerPool.writeWorker that's
never allocated. (The code before this patch will not crash though, because
wWorkerPool is zero-initialized global variable and therefore the
accidental free will be a nop).
2. In general the order of calling cleanup function should be reverse
to the order of calling init function, but this is not the case prior
to this patch (see dnodeCleanupMnode() and dnodeCleanupMgmt()).

* Bonus fix
This patch also fixes a missing free for readPool.readWorker.

* Testing
I plan to run the test script ./test-all.sh, but was not able to do so.
Is there a reference somewhere I can look up?

Feature/2.0tsdb

Proper error handling in dnodeOpenVnodes / dnodeCloseVnodes

[Trivial] Fix initialization code of TSDB_MOD_MGMT module.

rpc shall not check peer IP address, it shall only use FQDN

* Description
These two functions do not properly handle any error returned from
dnodeGetVnodeList(). This patch als changes the signature of
dnodeGetVnodeList() to make sure it returns only status, and number
of vnodes is passed out through a separate argument.

* Testing
Before the patch, if I start taosd and then remove 'vnode' folder,
the shutdown message would include the following:
05/03 14:26:17.158204 0x140025950476096 DND total vnodes:-2147483296 are
all closed

This shows the code uses error code as vnode count.

After the patch, it outputs proper error message:
05/03 14:30:45.044762 0x139933723604800 DND Get dnode list failed

* Description
These two functions do not properly handle any error returned from
dnodeGetVnodeList(). This patch als changes the signature of
dnodeGetVnodeList() to make sure it returns only status, and number
of vnodes is passed out through a separate argument.

* Testing
Before the patch, if I start taosd and then remove 'vnode' folder,
the shutdown message would include the following:
05/03 14:26:17.158204 0x140025950476096 DND total vnodes:-2147483296 are
all closed

This shows the code uses error code as vnode count.

After the patch, it outputs proper error message:
05/03 14:30:45.044762 0x139933723604800 DND Get dnode list failed

* Description
This patch fixes enablement of TSDB_MOD_MGMT module, which was
incorrectly assign to 'name' variable.

* Testing
Compile the code. Feel free to suggest more testing that needs to
be done. Given that 'tsModule' is zero initialized, I don't think
there's any functional difference for this patch.

if resposne is received, and no corresponding connection there, it sh…

maxId is from 1 to maxSession

initialize SCqCfg structure

remove two unsed fields in tsclient.h

Feature/cluster

Feature/2.0tsdb

fix maxTables problem

Feature/stream