configs: update epel-7 koji repo to use correct URL
    
    - from Ken Dreyer <ktdryer@ktdryder.com>
      - Use RHEL 7 RC mirrorlist URLs
    from Miroslav Suchý <msuchy@redhat.com>
      - add support for subscription-manager (RHSM)
      - expand tabs for better readablity
      - cut of everything after decimal point, if there is some [BZ# 1098477]
      - better code readablity
      - clarify the log messages
      - use metalink instead of mirrorlist in yum config
      - set LC_MESSAGE to C before executing command [BZ# 519258]
      - use ctypes.get_errno() instead of ctypes.c_int.in_dll(_libc, "errno")
      - revert 7ec6a1e9d202ab56fb31c914dbf7516c045e56ab (python 2.4 workarounds)
      - buildroot and %clean is not needed for el6 and fedoras
      - description should always end with dot
      - remove shebang from mockbuild/mounts.py
      - %defattr is not needed since rpm 4.4
      - remove el5 conditional
      - use createrepo_c which is much faster
      - whitespace fixes
      - remove unused variables: 'username' and 'hdr'
      - better logging of kernel version [BZ# 1048826]
      - partially revert 9db6edb33cc34a450e762eb5d2bedf9067ebc419 [BZ# 1034805]
      - teach mockchain about ftp [BZ# 1061776]
    from Jerry James <loganjerry@gmail.com>
      - fix post scriptlet to deal with rawhide [BZ# 1083689]