util: New function for unix domain socket calls.
util: New function for unix domain socket calls.

If we want to do local calls to OVN NB, we need not
use IP addresses or SSL certs.  An upcoming commit
will have the first user.

Signed-off-by: Gurucharan Shetty <a1872e333d0e52644f6125da2276530f7ebe5e77@ovn.org>

shettyg/ovn-kubernetes,shettyg/ovn-kubernetes,shettyg/ovn-kubernetes