[Config]: if a coloumn family is already present, change log message level to info from warning
[Config]: if a coloumn family is already present, change log message level to info from warning

As part of daemon intialization, column families gets created and if they are already
present, then column families gets altered and warning message gets logged in.

This is not either a warning or a error, hence changed this to Info level message.

Change-Id: Idbcc9679a61219a02a05d415ae149eb812599961
Closes-Bug: #1480011

codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller