Enable API testing with standalone cephfs-nfs job

Recently [1], we turned off a bunch of tests since we
were building out a way to run nfs-ganesha
standalone with a cephadm based ceph cluster [2].

Running API tests will increase the coverage. We
can retain the "backend" filter in our test regex
since we still don't want to run any API only tests
in this job.

[1] I5b7fd5b2b557203189c25fa2a988d790e7fda3eb
[2] If983bb5d5a5fc0c16c1cead84b5fa30ea961d21b

Change-Id: I2198eee3892b2bb0eb835ec66e21b708152b33a9
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
1 file changed