Refer to VistA-M repository instead of VistA-FOIA

The OSEHRA VistA M component history has been extracted from the
VistA-FOIA.git repository and published in a VistA-M.git repository.
Replace use of "VistA-FOIA" in the OSEHRA VistA source tree with
"VistA-M" or other wording as appropriate.

Change-Id: I0934481437fcd25190b197017c2fb0ab70dd9073