Bump versions on the devel branch (devel branch version is 1.6)
Remove the legacy templating code, which was guarded by deprecation warnings in the previous two releases, and undocumented for a long time.  use {{ foo }} to access variables instead of ${foo} or $foo.
Start the 1.6 changelog
Remove a few extra legacy variable feature references.
Update CHANGELOG.md
Merge pull request #6231 from seizans/patch-1

Update CHANGELOG.md
Fix up examples in the assert docs to match the way things work.
missing import in assert module

Fixed missing ansible.errors import in assert module
added better gentoo/funtoo support
Merge pull request #6235 from Tefnet/patch-1

missing import in assert module
typo fix
get rid of newline chars when reading password file
Adds modules for managing Amazon RDS parameter and subnet groups.
Merge pull request #6237 from bcoca/genfuntoo

added better gentoo/funtoo support
Merge pull request #6239 from lathan/typo

typo fix
Merge pull request #6240 from fesplugas/devel

get rid of newline chars when reading password file
Merge pull request #6242 from scottanderson42/rds-group-modules

Adds modules for managing Amazon RDS parameter and subnet groups.
Fix regression causing setup to run for every play

This patch makes sure setup only runs once, unless it is enforced on a play.
Merge pull request #6250 from dagwieers/gather_facts-once

Fix regression causing setup to run for every play
Revert "Merge pull request #6250 from dagwieers/gather_facts-once"

This reverts commit b769b4181a18f36dcdebe6ebb7fed31569f06d75, reversing
changes made to 1e01fb856d964ac3c7bfdbc4cc8da05fb6516769.