dsturl used to write to disk a file retrieved from tape now sudos to root using eos.ruid=0 and eos.guid=0

Adding selectors in persistent volume claim as we are now using kubernetes >1.3 and we need to manage more resources with pv than before (logs issue, others?)

now expiring artifacts after 30 days as the repository was reaching 10GB quota limit (by the way this limit has been raised to 20GB today).

Adding more explicit errors (TIMED OUT) and validating steps during instance creation. Add  option to  so that the namespace can be kept after the system test.

Now `run_systemtest.sh` can be used standalone, outside of CI environment.

[itdssbuild01] CTA_build > cta-xrootd_plugins-fakeeos localhost 10955 '/my_dir?a=apple&b=banana'
Hello World
status.ToStr()=[SUCCESS]
status.IsError()=false
status.IsFatal()=false
status.IsOK()=true
[itdssbuild01] CTA_build > tail -n 1 /var/log/cta/cta-frontend.log
Feb 23 19:37:35 itdssbuild01 cta-frontend: <158>2017-02-23T19:37:35.584734+01:00 cta-frontend[23717]: LVL="Info" TID="23730" MSG="FSctl called" arg1="/my_dir" arg2="a=apple&b=banana" client->host="localhost" client->name="smurray"
[itdssbuild01] CTA_build >