Release/2.0.0

[ashah-splunk]

Version 2.0.0

Feature updates

• ensure_binary, ensure_str and assert_regex utility methods have been migrated from six.py to splunklib/utils.py

Major changes

• Removed Code specific to Python2
• Removed six.py dependency
• Removed __future__ imports
• Refactored & Updated splunklib and tests to utilise Python3 features
• Updated CI test matrix to run with Python versions - 3.7 and 3.9
• Refactored Code throwing deprecation warnings
• Refactored Code violating Pylint rules

Bug fixes

• #527 Added check for user roles
• Fix to access the metadata "finished" field in search commands using the v2 protocol.
• Fix for error messages about ChunkedExternProcessor in splunkd.log for Custom Search Commands.