dual license: update remaining files with correct license text

Sayan Saha has previously approved changing everthing to dual license
but somehow we have missed changing these files.

I am explicitly not updating the copyright dates as nothing else that's
copyrightable has changed in these files with the license change

Change-Id: Ia965eeb7168447d69e28e939ad95ee388873b6e4
BUG: 951549
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/6128
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>