rpc: avoid duplicating config in virtlockd/virtlogd augeas tests

rpc: avoid duplicating config in virtlockd/virtlogd augeas tests

Most of the augeas test files use ::CONFIG:: to pull in the master
config file for testing. This ensures that entries added to the config
file are actually tested by augeas.

This identified the missing admin_max_clients example in the virtlogd
config file, which in turn prompted a change in description of the
max_clients parameter, since these daemons don't have separate
readonly & readwrite sockets.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>