debug/error-gen: Add support for reconfiguring options.

Change-Id: Ia10dc29e8608b02037b08e32a72766b6d43a98ba
BUG: 915280
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/4576
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>
mgmt/glusterd: Expose error-gen options through volume set.

Change-Id: I7c696d99b43544923fb96d177229cdbac32c09fe
BUG: 915280
Signed-off-by: Vijay Bellur <vbellur@redhat.com>
Reviewed-on: http://review.gluster.org/4577
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>