jstat in container does not work

Same as https://issues.jboss.org/browse/CLOUD-2070

jstat in a container built with the FIS images does not work

There are two reasons:

• jstat needs to have "whoami" reporting a valid username for the current UID (which is random on openshift)

• jstat needs to be able to write to /tmp/hsperfdata_<username> (probably "jboss") , if the given username was also used during s2i build, the directory would exist at runtime, but owned by a different UID. To fix that, /tmp/hsperdata_jboss should be removed during s2i build

see also

https://issues.jboss.org/browse/CLOUD-2070
and
https://issues.jboss.org/browse/CLOUD-1185