Fixes typo: glance exception additional dot

when I try to fix the glanceclient html output, i found the result has
additional dot before the word quota,as follow
Denying attempt to upload image because it exceeds the .quota: The size
of the data 41126400 will exceed the limit. 11210240 bytes remaining

Change-Id: I5df61d9d17cf24ce9b58bebbefb610b7043fc39c
Closes-bug: #1404820