Console: warn that the Nova VMRC console driver will be deprecated in K

This code is not used and should be deprecated. In addition to this the
ESX driver was deprecated in commit 1deb31f85a8f5d1e261b2cf1eddc537a5da7f60b

Closes-bug: #1368202

Change-Id: Ic71cf4d01ccd7eee19f6c44e1101e542900235d6
Merge "Console: warn that the Nova VMRC console driver will be deprecated in K"