This patch sets put in whitespace check against all files except .tgz,
files in hidden directory or things in the doc/build folder. Enforcing
the cleanup work in [0]. Also fixed two readmes' trailing blank spaces.
[0] https://review.openstack.org/#/c/466409/
Change-Id: I21ee232e4d502ca2db9dbf012624d6552d0f7ad2
