Fix centos support for bindep-fallback.txt
Fix centos support for bindep-fallback.txt

Looking at the current experimental job[1] we can see 5 packages that
fail to install, 3 are mysql, 1 python3-devel and 1 dvipng. This patch
updates bindep to use the RHEL based package names.

[1] http://logs.openstack.org/94/264994/4/experimental/gate-bindep-fallback-devstack-centos7-nv/f7d9d8e/console.html

Change-Id: I4404aa2c3084c35849964b67ff8c8a3a0342806e
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config,noorul/os-project-config,dongwenjuan/project-config,noorul/os-project-config,openstack-infra/project-config