Fix erroneous conflicts for munge packaging

[koomie]

From the email lists, a user noticed an issue regarding conflicts for the munge packaging:

* Found 3 pre-existing rpmdb problem(s), 'yum check' output follows:
munge-devel-ohpc-0.5.12-15.1.x86_64 has installed conflicts munge-devel:
munge-devel-ohpc-0.5.12-15.1.x86_64
munge-libs-ohpc-0.5.12-15.1.x86_64 has installed conflicts munge-libs:
munge-libs-ohpc-0.5.12-15.1.x86_64
munge-ohpc-0.5.12-15.1.x86_64 has installed conflicts munge:
munge-ohpc-0.5.12-15.1.x86_64

Upon inspection, this is due to the package conflicting itself (it both conflicts and provides munge). It should be updated to only conflict as the intent was to avoid confusion with the distro-provided version of munge.

[koomie]

After removal of the self-conflicting statements, can confirm that no conflicts are seen post-installation from the latest CI run:

# rpm -qa | grep munge
munge-libs-ohpc-0.5.12-18.1.x86_64
munge-ohpc-0.5.12-18.1.x86_64
munge-devel-ohpc-0.5.12-18.1.x86_64
slurm-munge-ohpc-16.05.5-25.2.x86_64

# yum check
Loaded plugins: fastestmirror
check all
#