Adds live migration support to cells API

Fixes bug 1153087

DocImpact: Cells now allows live migration within a cell,
but not between cells.

Change-Id: Ic8777c376883eaf6ff9cb4b379e0bacbfe5635b7
Merge "Adds live migration support to cells API"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp