Remove unused method in RouteSet test.

Follow up to #15109.

/cc @Gaurav2728

/cc @yahonda

The bit of URL generation that is optimized is the generation of
the path so things like :host, :port, etc. are irrelevant.

They should not be used on people application so they should not be
present on the API documentation.

[postgres] remove (outer) sub-class declarations with nested modules/classes

parent_name is a string of nil, never a blank string so we don't need to
use presence.

Fix how to compute class name on habtm namespaced.

Conflicts:
	activerecord/CHANGELOG.md

Make filter_binds filter out symbols that are equal to strings

Conflicts:
	activerecord/CHANGELOG.md

ActiveRecord::Relation::Merger's filter_binds method does not filter out bind
variables when one of the attribute nodes has a string name, but the other has
a symbol name, even when those names are actually equal.

This can result in there being more bind variables than placeholders in the
generated SQL.  This is particularly an issue for PostgreSQL, where this is
treated as an error.

This patch changes the filter_binds method to make it convert both attribute
names to strings before comparing.

Add controller and action name to the fragment caching instrumentation payload

Conflicts:
	actionpack/CHANGELOG.md

Add multiple lines message support for SSE module

remove warning `ambiguous first argument; put parentheses or even spaces`

Add missing information, ref[#522c0fdb]

Use i18n master to run tests

Update Redcarpet to 3.1.2

This version fixes an API breakage between 3.0 and 3.1 ; the header
method's arity should not have changed.

[ci skip]

If we don't return early Ruby will memoize the value of the prefix of
the parent class what will make the subsequent searchs to not work as
expected.

If the early return we are avoiding the memoization.

But when using the deprecated path we need to memoize the value, so we
are not using early return for the deprecated path.

These methods are private API.

This is the rebased version of #15026

Closes #15026

Fixed Attribute Inheritance Issue

[Brad Bennett, Jessica Yao, & Lakshmi Parthasarathy]

... 'shared' OID, ArrayParser and Cast helpers, also re-arranged Column's dependencies

Fix reference to sanitize helper test suite [ci skip]