wic: Rename MountError

wic doesn't mount anything, so can't have a mount error; rename it to
something more appropriate.

(From OE-Core rev: e1edee656fc9c0a791c0eb62796d1afa483be34e)

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/mic/utils/errors.py

@@ -40,11 +40,8 @@ class Usage(CreatorError):
             self.msg = str(self.msg)
         return self.keyword + self.msg + ', please use "--help" for more info'
 
-class Abort(CreatorError):
-    keyword = ''
-
 class KsError(CreatorError):
     keyword = '<kickstart>'
 
-class MountError(CreatorError):
+class ImageError(CreatorError):
     keyword = '<mount>'