Replace dup_nsvc() in test_mbs.py
dup_nsvc prints version in hexadecimal instead of integer. This is found
in libmodulemd 1.6.2 f28 build. This bug has been fixed in upstream but
not release yet. Before the release, this patch formats NSVC manually to
workaround it.
Signed-off-by: Chenxiong Qi <cqi@redhat.com>