Text formatting changes

These are some text fixes in document, scripts and functions,
including variable usage, text aligning, adding new store class in
document

Change-Id: I98e226969d86698972870a7b3a042cb00c2206e9
Update .mailmap

Change-Id: I5dc51c7aeb080945201376c42250502de601384a
Adding metadata checking to image location proxy layer

Enable image locaton proxy checking metadata when the location changing.
Implemented bp: location-proxy-metadata-checking

Change-Id: If411a454cd2c3e277ea9840cc3d83ec5125bb372
Signed-off-by: Zhi Yan Liu <zhiyanl@cn.ibm.com>
Add space in etc/glance-cache.conf

Add space in "known_stores" block in etc/glance-cache.conf,
and keep glance code tidy and pleasing.

Change-Id: If112db41bfbce9f78013fe33229043f0f626f3f9
Merge "Update .mailmap"
Merge "Text formatting changes"
Merge "Adding metadata checking to image location proxy layer"