Werk #15545: Introduce Python 3 compatibilty for mk_sap agent plugin

The mk_sap agent plugin can now be used with Python 3.

Previous to this werk, mk_sap could only be used with Python 2, as it was dependent on the sapnwrfc library which is not compatible with python3.

This werk ports mk_sap to use pyrfc which is only compatible with Python 3

The old mk_sap plugin can still be used with Python 2 and is now called mk_sap_2

If the host this agent plugin is executed on has Python 3 installed:

• install pyrfc on this host (for more details have a look at the mk_sap.py agent plugin source code)
• redeploy agent via bakery or manually

If the host this agent plugin is executed on has only Python 2 installed nothing changes. The Python 2 agent plugin will automatically be used in this case.

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