parallels: process '/' mount point correctly for containers

Since we are going to add block devices as root disks we have
to specify root mount point for boot block devices. But we
shouldn't do this if a filesystem disk with such
target mount point already exists.
Signed-off-by: NMaxim Nestratov <mnestratov@parallels.com>

src/parallels/parallels_sdk.c

@@ -3080,6 +3080,13 @@ static int prlsdkAddDisk(PRL_HANDLE sdkdom,
 
         if (prlsdkAddDeviceToBootList(sdkdom, devIndex, devType, 0) < 0)
             goto cleanup;
+
+        /* If we add physical device as a boot disk to container
+         * we have to specify mount point for it */
+        if (isCt) {
+            pret = PrlVmDevHd_SetMountPoint(sdkdisk, "/");
+            prlsdkCheckRetGoto(pret, cleanup);
+        }
     }
 
     return 0;
@@ -3314,6 +3321,13 @@ prlsdkDoApplyConfig(virConnectPtr conn,
             goto error;
     }
 
+    for (i = 0; i < def->nfss; i++) {
+        if (STREQ(def->fss[i]->dst, "/"))
+            needBoot = false;
+        if (prlsdkAddFS(sdkdom, def->fss[i]) < 0)
+            goto error;
+    }
+
     for (i = 0; i < def->ndisks; i++) {
         bool bootDisk = false;
 
@@ -3327,11 +3341,6 @@ prlsdkDoApplyConfig(virConnectPtr conn,
             goto error;
     }
 
-    for (i = 0; i < def->nfss; i++) {
-        if (prlsdkAddFS(sdkdom, def->fss[i]) < 0)
-            goto error;
-    }
-
     return 0;
 
  error: