API to get the Cell Capacity

The total RAM and the available RAM are stored in memory of CellStateManager.
This API gets the available slots per flavor for a given cell.

Implements: blueprint get-cell-free-ram
Change-Id: I2a6dbb8835cad04f3ee058c3012490782d7c8e67
Merge "API to get the Cell Capacity"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp