ignore .idea folder in glance

If we use JetBrains PyCharm as python develop tool, JetBrains PyCharm
would automatically generate its config folder name .idea in the root
dir of your python code.
Many Code projects, such as nova and cinder, have ignore .idea folder.
Project glance should also ignore .idea folder.

Change-Id: I1e3ba1936c8b918aa4669c2d7fceac23a23ca974
Closes-Bug: #1362451
Merge "ignore .idea folder in glance"