Parameterize SSL certificate attributes on review.pp manifest

review.pp manifest contains site specific values for
SSL certificate attributes.
The hostname may change overtime and forces other developers
willing to use the manifest to give SSL certificate names
that are not descriptive of their environment.
This change parameterize those values by adding SSL certificate
parameters on review.pp and gerrit.pp and defining sane
defaults for both.

Closes-Bug: 1319746
Change-Id: I245c3caaf267f3d354daa5c7d5897d62239dcf9e
Merge "Parameterize SSL certificate attributes on review.pp manifest"