Adds HTTPS support for Compute metadata

Adds metadata https configuration settings to the Compute security
hardening section.

Change-Id: I7524f7c5567f1cc34553e67bc314c414320591a4
Closes-Bug: 1310862
Added scheduler filter AggregateImagePropertiesIsolation

Added new scheduler filter AggregateImagePropertiesIsolation
with example and conf-file properties. Also updated default
filter line to match current nova.conf file.
Added ceilometer.conf back into common; telemetry project
has gotten rid of their sample file so could no longer link
to it (and could not build without).

Closes-bug: #1308333

Change-Id: I11c9248756c22fa2980d539c7186c1cf41f48afc
Merge "Added scheduler filter AggregateImagePropertiesIsolation"
Merge "Adds HTTPS support for Compute metadata"