Python 3: fix most tests for ansible.module_utils.basic

Windows: Added parameter validation to the get-attr function / Get-AnsibleParam 

Fixes #12482

Also added --ignore-certs option for use with install and search commands. Helpful when
overriding server and server has self signed cert.

Make ansible-vault view not write plaintext to a tempfile

CLI already provides a pager() method that feeds $PAGER on stdin, so we
just feed that the plaintext from the vault file. We can also eliminate
the redundant and now-unused shell_pager_command method in VaultEditor.

(I don't have a system with selinux to test if the module still wants
byte strings even on Python 3.)

(Reminder: cannot use six here, module_utils get shipped to remote
machines that may not have six installed -- besides six doens't support
Python 2.4.)

Python 3 doesn't have 'basestring' and 'unicode'.

Python 2.4 doesn't have 'bytes'

This caused an ImportError in a test module and showed up as one test
failure.  Now the test module can get imported and many more tests fail
(on Python 3).  Such is life.  ;-)

task logging revamp

facts: correctly detect docker inside a xen host

Guidance for pycrypto install on Mac OSX

Fixes #12558

Fixes #12527

Inject existing groups at InventoryDir initialization

Bring groups handling in ini.py up-to-date (trivial fix)

Releases are named after Led Zeppelin songs as of 2.0.0.

Since c8f2483d, ini.py expects to always be passed in a pre-created list
of groups, and can no longer deal sensibly with an empty list; this just
makes that expectation clear.

Fixes #12563

Fixes #12560

Fixes #12536

Describe the units for fact_caching_timeout

This fixes a corner case where ini files live in a subdir
of the main inventory directory.

Reproducing the original error:

mkdir -p inventory/ini
cat > inventory/ini/hosts << EOF
[www]
www1
EOF

$ ansible -i inventory/ all -m ping
ERROR! 'all'

(or without the [www] group, it would complain about 'ungrouped')