Previously, it is impossible to know if the goconerver is started
by xcat. This patch add a marker in /etc/goconserver/server.conf
to help check the status. In addition, use server-cred.pem instead
of server-key.pem as it is not exist on SN.
This patch also control the service status of goconserver and conserver
when restarting the xcatd service on service node.
```
[root@sn02 ~]# chdef sn02 setupconserver=1
1 object definitions have been created or modified.
[root@sn02 ~]# service xcatd restart
Restarting xcatd (via systemctl): [ OK ]
[root@sn02 ~]# ps -ef | grep conserver
root 27679 1 0 02:26 ? 00:00:00 /usr/sbin/conserver -o -O1 -d
root 27680 27679 0 02:26 ? 00:00:00 /usr/sbin/conserver -o -O1 -d
root 27756 26188 0 02:26 pts/1 00:00:00 grep --color=auto conserver
[root@sn02 ~]# chdef sn02 setupconserver=2
1 object definitions have been created or modified.
[root@sn02 ~]# service xcatd restart
Restarting xcatd (via systemctl): [ OK ]
[root@sn02 ~]#
[root@sn02 ~]#
[root@sn02 ~]#
[root@sn02 ~]# ps -ef | grep conserver
root 27885 1 0 02:26 ? 00:00:00 /usr/bin/goconserver
root 27986 26188 0 02:33 pts/1 00:00:00 grep --color=auto conserver
```
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