cli: Error out when character "." is available in volume name

previously it was failed without showing any information why it is failed.

Now with this fix, when "." or any non alphanumeric character
present in volume name, it will give error messages

Change-Id: I17e8e69c08345c4d760f3ba333fe841e754bc9c8
BUG: 921215
Signed-off-by: ggarg <ggarg@redhat.com>
Reviewed-on: http://review.gluster.org/7364
Reviewed-by: Humble Devassy Chirammal <humble.devassy@gmail.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>