Documentation: Port Wiki pages by kthlnkeating to .rst

Create .rst documents that match the pages that user kthlnkeating added
to the Wiki pages about setting up the testing environment.

Pages to match:
http://www.osehra.org/content/obtaining-vista-foia-code and
http://www.osehra.org/content/automated-vista-configuration-and-automated-functional-testing

Edit ImportCache and ImportGTM to remove the references to cloning the
Vista M repository.  These commands would duplicate the information in the
ObtainingVistAMCode.rst file.  Add the section about the secondary import
of ZTLOAD1.ro in the GT.M system to ImportGTM.

OSEHRA-Issue: http://issues.osehra.org/browse/OAT-56
Change-Id: Ie14c7b6f49a1553b68bc83971fe7c8ec597619e1