Add autogen.sh dependency checks and nicer output.

Change-Id: I5c740d81765559fae022d0ab9dfe34988e46612e
BUG: 919898
Signed-off-by: Justin Clift <jclift@redhat.com>
Reviewed-on: http://review.gluster.org/4651
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>