add a status.sh to containers

[belforte]

e.g. on REST we have

crab3@crabserver-644cb69d77-n7sqw:/data$ ./manage.py status
crabserver is RUNNING, PID 67
crab3@crabserver-644cb69d77-n7sqw:/data$ 

which by the way is broken, since in that case at least proc 67 is gone and the correct one is 68

but in TW

crab3@crab-dev-tw01:/data/srv/TaskManager$ ./manage.py status
Error: Not implemented.
crab3@crab-dev-tw01:/data/srv/TaskManager$ 

We'd like status to not only indicate if process is running, but also whether it run code from the container /data/srv/current/lib... or from the local GithHub repository /data/repos/....

that can be done with this trick from @novicecpp

crab3@crab-dev-tw01:/data/srv/TaskManager$ cat /proc/18/environ |tr '\0' '\n'|grep PYTHONPATH
PYTHONPATH=/data/srv/current/lib/python/site-packages/:
crab3@crab-dev-tw01:/data/srv/TaskManager$ 

./status.sh could also print the version number ( tag name)

[belforte]

#8737 will fix main requirement here, only thing to add is version number, just a convenience...