nfs-utils: add initial tests for statd that run via "make check"

Leverage the support that automake already has for running tests via
make check. Add a simple test that just checks that the statd mon and
unmon calls actually work.

Adding more tests should be a simple matter of adding new scripts
exit 0 on success and non-zero on fail, and adding those to the
Makefile.am.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve Dickson <steved@redhat.com>