well here is your problem
you are using CentOS 6
but installed the incompatible "remi" repo for RHEL7
uninstall the redhat/cent 7 programs from Cent 6
for a list of installed 7 programs
Code:
su -
rpm -qa | grep el7
then UNINSTALL ALL of them
and the cent7 remi repo
then install the remi 6 repo and "yum-priorites " plugin
and CONFIGURE!!!! IT!!!!
-- you NEED TO manually configure it
read the cent documentation on the cent wiki
http://wiki.centos.org/
-- the yum plugin
http://wiki.centos.org/PackageManagement/Yum/Priorities
and the third party repo page
http://wiki.centos.org/AdditionalResources/Repositories
PS.
This might be a lost cause and UNFIXABLE!!!
you might have to reinstall