Fixes build of compute admin guide.

Fix bug 1096168, choosing a host to launch instance upon
Fix bug 1098567, project id instead of project name for scrub

Removes replicated XenAPI - NFS file and makes pointers to single file

Change-Id: I80de83afd8a535401098035be05fe734edb328fe
Fix bug 1159670

Fix image references to a common figures directory so more than one
manual can point to them.

Change-Id: Ib810bccb006adcf438a8d52983f93b153674265c
Keep fixing build.

Fix bug 1159454, small "dive/drive" typo
And clarifies ephemeral vdb disk

Change-Id: I1331f75a2d2d29e4f2cbb186652e74b20b73e5ee
Adds ceph architecture figure.

Change-Id: Iccc9f74cccb111871613756992480640c980fedb