Python 2 support for sonic-pcied was removed, and the Python 2 version
of the variable no longer exists.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
Removed python2 support for sonic-platform-daemons that was causing unit
test errors in sonic_pcied.
* Removed config from docker supervisord jinja templates per VD review comment
* Removed space and python3 per QL comments
**- Why I did it**
python2 is end of life and SONiC is going to support python3. This PR is going to support:
1. Build pmon daemons with python3
2. Install and run python3 version pmon daemons
**- How I did it**
1. Change pmon daemons make files to build bothe python2 and python3 whl
2. Change docker-platform-monitor make files to install both python2 and python3 whl
3. Change pmon docker startup files to start pmon daemons according to the supported platform API version
