Remove unused import of oslo.config

Remove unused import in glance.cmd.cache*,
and make glance code tidy and pleasing.

Change-Id: Ie5d2cf5c1a52fda505a1dd4d5b01267285a10c00
Fix Sphinx warning

Title underline was too short.

Change-Id: I2915f9d3ad0b208286d447ef2375e51f51b7e35d
Merge "Remove unused import of oslo.config"
Merge "Fix Sphinx warning"
Rule parser for property protections

This patch introduces the way protected properties
will be configured and parsed.

Related to bp api-v2-property-protection
docImpact

Change-Id: I3d24cacccf3f51b07a4090b8a5db1f2451090762
Property Protection Layer

This patch introduces the property protection layer and the tests
associated with it

Related to bp api-v2-property-protection

Change-Id: Iaf2111bf07377ef6a4c89a621888077cc14be776
Enable protected properties in gateway

Related to bp api-v2-property-protection

Activate property protections if the config value is set.
Added the corresponding functional and unit tests.

Change-Id: If38604d812c34416b8369bf6f868a0f2509c2649
Implement protected properties for API v1

Related to bp api-v2-property-protection
docImpact

Change-Id: Ia56ca251e78f37dcd6cf63c9696f0e5e07ed5f5c