apt: fixed pkg=<name>=<version> fails if package is not yet installed.

Reported and patch provided by https://github.com/msolo. Closes GH-5625.
Filter out messages that match the pattern username:password@host

This filtering is done in both the module invocation logging and in
the regular verbose() logging output.

Fixes #4087
Update CHANGELOG.md
Allow equal sign in single-line ini variables
Merge pull request #6001 from jimi-c/issue_4087_sanitize_output

Filter out messages that match the pattern username:password@host
Merge branch 'allow-equals-in-ini-vars' of https://github.com/worklez/ansible into worklez-allow-equals-in-ini-vars
Remove superfluous/invalid quote

Allow the example to be copy-pasted with minimal confusion about the error.
Merge pull request #6014 from amirhhz/patch-1

Remove superfluous/invalid quote
Spelling correction
Merge pull request #5645 from resmo/fix/apt_pkg_version

apt: fixed pkg=<name>=<version> fails if package is not yet installed.

Tested and it fixes the problem on more recent versions of apt.
Merge pull request #6015 from angstwad/docfix

Spelling correction.
Config resoution order correction and documentation.
Minor existing typo fix.
Merge pull request #6021 from risaacson/issue_5359_2

Config resoution order correction and documentation.
Micro-optimization of inventory.expand_hosts.detect_range
Micro-optimization: replace s.find(x)!=-1 with x in s

timeit shows a speedup of ~3x on Python 2.7.5 x86_64.
It also makes the code a bit shorter.
hostname module: don't filter hostnamectl with awk

There's no need to filter hostnamectl's output with awk because its man
page says:

    hostnamectl [OPTIONS...] {COMMAND}

       --static, --transient, --pretty
	   If status is used (or no explicit command is given) and one
	   of those fields is given, hostnamectl will print out just
           this selected hostname.

E.g. hostnamectl --static status => ansible.example.org