selftest: fix samba3.rpc.samba3.netlogon running after an nt4_member test
samba3.rpc.samba3.netlogon is using get_myname to find a username with which to
perform a join. This means that the test tries to join with the existing
localnt4dc2 user, which happens to work if get_myname is working
correctly (which it isn't -- see next commit about NSS_WRAPPER_HOSTNAME!)
This commit fixes a test run with, for example:
TESTS="samba3.blackbox.smbclient_ntlm.plain samba3.rpc.samba3.netlogon"
(given samba3.blackbox.smbclient_ntlm.plain is in the nt4_member env)
...which previously failed due to the combination of this and the
NSS_WRAPPER_HOSTNAME bug.
Signed-off-by: Jamie McClymont <jamiemcclymont@catalyst.net.nz>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>