Add Promiscuous and Temp SMB Servers

[dotPY-hax]

This PR offers some improvements to the SMB part of impacket.

• refactored the authentication logic to happen inside the SMBServer class instead of smbComSessionSetupAndX which allows for custom authentication logic to be implemented on server level instead of protocol level.
• PromiscuousSMBServer inherits from SMBServer and allows to give authenticated sessions to any user with any password, specific users with any password or the classic username:password authentication. This allows to use proper authenticated sessions without having to maintain credentials. This class can be used by either SimpleSMBServer or other implementations.
• SimpleTempSMBServer inherits from SimpleSMBServer and uses only temporary files. This allows easier use of SMB as payload delivery. Further SimpleTempSMBServer can be used as a context manager and cleans up after exiting which is useful for tool development and attacks which specifically use SMB shares.
• examples/tempsmbserver.py uses PromiscuousSMBServer and SimpleTempSMBServer to act as an easy to use payload delivery and file receiver. A detailed description can be found in the description part of the example file.

The refactor passes all existing local tests (pytest -m "not remote" ), the new functions in PromiscuousSMBServer and SimpleTempSMBServer received their own tests. The functionality has been tested manually in kali with impacket tools and nxc.