Consistent use of identity comparison (`is`/`is not`) for None
Bugfix: Removing a line that shouldn't have been brought back in during merge
Merge remote-tracking branch 'upstream/develop' into consistent-identity-comparison-none

Conflicts:
	boto/manage/server.py
Merge pull request #1930 from oxtopus/consistent-identity-comparison-none

Consistent use of identity comparison (`is`/`is not`) for None. Fixes #1930.
Fixed a quoting bug of special characters in S3.
Populate both next_token and nextToken. Fixes #1968.

This bug was introduced due to an issue with how boto handled the nextToken
field in responses, which meant that it was exposed with the incorrect
name. The fix caused existing code to break, so now both versions are made
available. New code should use next_token.
Added release notes for 2.22.1.
Bumped to v2.22.1!
Merge branch 'hotfix-2.22.1' into develop