Enabled the direct installation of RPM and gppkg

* RPM is installed in a local directory without using superuser
  priviledge

* gppkg is installed using normal installation

* Let the user choose whether to clean up all intermediate files,
  installations

* Output more information with better format into the log file

* Stopped tracking dbsettings.py, instead we track dbsettings.py.example

* Use os.path.realpath instead of os.path.abspath for possible links

* Added load_data bash script on the highest level of madlib_testsuite