Consolidate common SONiC Python-language functionality into one shared package (sonic-py-common) and eliminate duplicate code.
The package currently includes four modules:
- daemon_base
- device_info
- logger
- task_base
NOTE: This is a combination of all changes from https://github.com/Azure/sonic-buildimage/pull/5003, https://github.com/Azure/sonic-buildimage/pull/5049 and some changes from https://github.com/Azure/sonic-buildimage/pull/5043 backported to align with the 201911 branch. As part of the 201911 port, I am not installing the Python 3 package in the base image or in the VS container, because we do not have pip3 installed, and we do not intend to migrate to Python 3 in 201911.
slave.mk: add SONIC_PLATFORM_API_PY2 as dependency of host
sonic_debian_extension.j2: install sonic_daemon_base and Mellanox-specific sonic_platform on host
mlnx-platform-api.mk: export mlnx_platform_api_py2_wheel_path for sonic_debian_extension.j2
sonic-daemon-base.mk: export daemon_base_py2_wheel_path for sonic_debian_extension.j2
daemon_base.py: hind unnecessary dependency of swss_common on host
