Clean SDP layering separation and move to /p4/common/site.
This change is confluent with the SDP direction of moving
files not part of the stock SDP into /p4/common/site.
This change entails:
* Move of hms files in /p4/common/bin to /p4/common/site/bin.
* Move of hms files in /p4/common/lib to /p4/common/site/lib.
* Elimination of dependency on SDP files in /p4/common/lib,
so that HMS can be deployed on a wider range of SDP versions,
and not be dependent on SDP bash library files.