added parameters to implement ip detection and cert cleanup more flexible
refactored change inspector, so that the log produced by puptest does not contain the word fail anymore, if it was only the tag deletion that failed. increased robustness by rescuing some git execution exceptions.
changed ip detection algorithm: uses msg received during callback now (before: ip detection algorithm parsed vm host log files)
updated documentation according to changes and setup results in rhel/centos env (git version max 1.8.2.3)