nfs::netapp::home backwards compatibility

bast1001 used to mount /vol/home_pmtpa via the
nfs::netapp::home::othersite class. Stop using that class and add an
extra parameter to nfs::netapp::home class to optionally specify the
site to mount. Then apply it to bast1001

Change-Id: I7513dbb1a7a46fcc2ad84b3f85250b728760331f