[Trivial]Add missing white spaces between words in log messages

This is to add missing white spaces between words in logs messages.

Change-Id: Iee1a859a0adb54fb5e3b925c3facb8178521e82d

Author: zhufl

nova/cmd/manage.py

@@ -2160,7 +2160,7 @@ def heal_allocations(self, max_count=None, verbose=False, dry_run=False,
             return 127
 
         if force and not instance_uuid:
-            print(_('The --instance flag is required'
+            print(_('The --instance flag is required '
                     'when using --force flag.'))
             return 127
 

nova/policies/server_topology.py

@@ -34,7 +34,7 @@
         # Control host NUMA node and cpu pinning information
         name=BASE_POLICY_NAME % 'host:index',
         check_str=base.SYSTEM_READER,
-        description="Show the NUMA topology data for a server with host"
+        description="Show the NUMA topology data for a server with host "
         "NUMA ID and CPU pinning information",
         operations=[
             {

nova/virt/libvirt/driver.py

@@ -592,7 +592,7 @@ def _set_cache_mode(self, conf):
             conf.driver_io = "threads"
             LOG.warning("The guest disk driver io mode has fallen back "
                         "from 'native' to 'threads' because the "
-                        "disk cache mode is set as %(cachemode)s, which does"
+                        "disk cache mode is set as %(cachemode)s, which does "
                         "not use O_DIRECT. See the following bug report "
                         "for more details: https://launchpad.net/bugs/1841363",
                         {'cachemode': conf.driver_cache})