Rails.logger should have level specified by config.log_level. 

Fix bug when log level of Rails.logger (which was set via config.logger) does not match the    config.log_level.
fix tests
update guide to reflect default HMAC SHA1 in MessageVerifier used in SignedCookieStore [ci skip]
remove language about configuring digest method [ci skip]
Minor optimization and code cleanup in query_methods.

- Use symbols rather than strings where possible to avoid extra object construction
- Use destructive methods where possible to avoid extra object construction
- Use array union rather than concat followed by uniq
- Use shorthand block syntax where possible
- Use consistent multiline block styles, method names, method parenteses style, and spacing
use drop and avoid a range object
extract habtm handling to a method
Fix ActiveSupport::Testing::Isolation on jruby

Hopefully the first of many related to #11700.

With these changes the railties tests wont 100% pass but at least they
will run and show the errors.

The first problem was the @method_name variable was never set.
This was causing ENV["ISOLATION_TEST"] to always be nil which
would cause the test output to never be written to the tempfile.

The second problem was that an invalid -t option was being passed
to minitest and minitest was erroring out.

The third problem was the run method needs to always return an
instance of the test class it is trying to isolate. We were returning
a ProxyTestResult instead.
fix the changelog typo[ci skip]
Removed redundant xml override from pg adapter

Closes: #11706
Merge pull request #11713 from rajcybage/fix_changelog

Fix changelog typos [ci skip]
Remove useless begin..end
Use map! to avoid an extra object creation
Replaced quotation marks for term by apostrophe

in getting started guide for section 5.6

[ci skip]
map => map! for stopping extra array creation
Merge pull request #11717 from rajcybage/fix_map

map => map! for stopping extra array creation
Merge pull request #11714 from jetthoughts/11706_remove_bad_override_of_xml

Removed redundant xml override from pg adapter
Use assert_nil instead of testing for equality
fix a gramatical mistake
Merge pull request #11718 from rShetty/patch-4

fix a gramatical mistake