CP-49641: Ignore errors mounting/unmounting explicit mount points

Code to handle "mount=" options were rewritten adding additional
error checking.
However this resulted in a feature regression as this poor error
handling is used as a "try next if fails" behavior allowing
to specify multiple devices for the same mount point. For
instance specifying
"mount=/dev/sda2:/mnt mount=/dev/disk/by-label/DEMO:/mnt" for the same
"/mnt" mount point the two possible device names were attempted.
So instead of giving error log the error and continue to restore
the old behavior.

Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>

disktools.py

@@ -1357,11 +1357,17 @@ def __init__(self):
 
     def mount(self):
         for m in self.mounts:
-            m.mount()
+            try:
+                m.mount()
+            except Exception as e:
+                logger.logException(e)
 
     def __umount(self):
         for m in self.mounts:
-            m.umount()
+            try:
+                m.umount()
+            except Exception as e:
+                logger.logException(e)
 
     def __enter__(self):
         self.mount()