license: xlators/protocol/server dual license GPLv2 and LGPLv3+

BUG: 951549
Change-Id: I3de5bd86d4238a60a0a85ba2e15d9c131969b210
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/4816
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>