Put units in paranthesis in Create Flavor form

In the Create/Edit Flavor forms and Project Quota forms:
- Admin -> Flavors -> Create/Edit Flavors
- Identity -> Projects -> Create Projects -> Quota

some of the units need to be enclosed within paranthesis to be
consistent with the way units are represented in other form like:
- Admin -> Images -> Create Image
- Project -> Volumes -> Create Volume

Change-Id: I96cd9f6c4fe46e51f462ff29a45182ded15b76dd
Closes-Bug: #1372029
Merge "Put units in paranthesis in Create Flavor form"