New block-based live migration

The ops guide originally discouraged block-based live migration.
However, there is now an improved implementation of block-based
live migration, so the wording has been changed to no longer
actively dissuade people from using it, while acknowledging that
the authors don't have firsthand experience with it.

Change-Id: Ie9ec49aa3b31f41b5e65087cac5037c78c021c69
Bug # 1172337 - Consolidated common files to "common" directory.

Consolidated XML files, and their dependencies, used by both the install and
compute admin guides in the "common" folder. Where a file was identified
as being used by only one of the two guides it was moved to that guide.

Change-Id: I2b6a8e711f08883a1565d671b8292c9ce5778237
Rewrites the Basic Install Guide for Grizzly

Fixes common for command.

Change-Id: I373439dc790fb430f834de502d7bc790a2a495e7
Merge "New block-based live migration"
Merge "Rewrites the Basic Install Guide for Grizzly"
Merge "Bug # 1172337 - Consolidated common files to "common" directory."