build: update e2fsprogs.spec for distro builds

build: update e2fsprogs.spec for distro builds

Add the distro version to the RPM release number, so that it the
RPM names do not conflict.

Allow the RPM built from upstream to replace the split packages
provided by the distros.  At some point in the future it may be
desirable to also split the RPM built by this spec file, but this
bs complicated by the fact that SLES and RHEL have different splits.

Change-Id: Iab8f75a7f7bd9790899a2024d91079d55501ef65
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>