* * osimage table schema change: add a "environvar" col in osimage table to hold environment variables used in osimage customized files
* osimage object schema change: add a environvar attribute, which refers to osimage.environvar
* the environment variables specified in "environvar" attribute will be exported during invocation of postinstall scripts in genimage
* support variables in synclists
* support environment variables in genimage,mkinstall,getpostscript
* support environment variables for xdcp -i -F in packimage
* add support for syncfiles with scp
* refine logic of EXECTUTE support message non rsync filesync
* refine syncfiles
* add startsyncfile script for cumulus
* refine format, fix updatenode without options causes command to crash #5142
`rmdef` command do not help clean up the recousrces that related to
the node when removing the node. this is a technical debt. This patch
is only a work around to add -C|--cleanup option to help remove the
entries in goconserver.
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
```
goconserver could send back message based on the client type
this commit set CONGO_CLIENT_TYPE to xcat to make the message
from goconserver more friendly.
