Hotfix release

Fixes

• 08b048d@If AzureCLI section is not in msticpconfig.yaml, no longer throws exception
• Updated AzureSentinel API notebook so that it has data (obfuscated).
• 3384c87@Updated .pre-commit-config.yaml to exclude tests from pylint and flake8 checks
  7b276a3@Adding azure-mgmt-core>=1.2.1 to requirements.txt
• Added exceptions to test_pkg_imports.py to skip vt and vt_graph_api (now extras)
• d3ad345@ Fixing to mordor_driver for Mitre web site change and making web scraping from Mitre more resilient
• Adding two scripts for testing pre-release msticpy.
• Some additions to VTLookupV3.ipynb text and trapping for import of nest_asyncio without installing
• ReadTheDocs conf.py now retrieves version number from main package build
• d8cc378@Updated ReadtheDocs requirements.txt
• db6e6f9@Changes to requirements,txt to remove unneeded dependencies (#114)*
• Added exclusions to conf.py and setup.py to skip install of some dependencies for ReadTheDocs (e.g. Kqlmagic).
  These packages will be mocked in their build - previously they caused dependency conflict errors in pip install
• Bug in azure_auth_core.py - raise from should have been an exception object, not a class
• Bug in secret_settings.py - potential uninitialized variable
• Updated test_mordor_driver.py to remove files on completion, Also marked file download tests as CI-only
• Added pylint and flake8 as pre-commit hooks - should stop fewer errors getting into build
• Some tidying of code (Sourcery) in azure_auth_core and secret_settings.
• Updated version to 0.8.7
• Fixing some typos and linting warnings in the documentation. Clarifying language.
• 3c87222@Updated vt-py version in requirements.txt (#113)