libvirt: Adapt the remote config in base.cfg to existing tests.

Since there are several tests in libvirt are using ENTER.YOUR as
the default configuration of remote, we should add this substring
into base.cfg.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Merge pull request #1361 from yangdongsheng/remote_fix

libvirt: Adapt the remote config in base.cfg to existing tests.