Fix adds enumerated list of available options in IPA server
installer and IPA CA installer help options

Fixes https://fedorahosted.org/freeipa/ticket/5435

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

Sprinkle 'pylint disable' comments over the code base to silence a bunch
of pylint warnings on Python 3. All silenced warnings are harmless and
not bugs.

https://fedorahosted.org/freeipa/ticket/4985

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>

`Knob` function is an old implementation which was replcaed by `knob`
function and currently is unused, so it can be removed

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>

Add new @group decorator to declare an installer class as a knob group
instead of subclassing Group, so that subclassing the installer does not
create duplicates of the original group.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>

Declare knob bases explicitly using a keyword argument instead of guessing
if the type argument is a base or a type of the knob.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>

Replace cli_name, cli_short_name and cli_positional knob arguments with a
single cli_names argument, which allows defining one or more CLI names
using the argparse convention ("--option" for long option name, "-o" for
short option name and "argument" for positional argument name).

Also replace cli_aliases with cli_deprecated_names which uses the same
convention.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>

Use type(None) rather than bool to define knobs which are represented as
command line flags. This allows declaring both "--option" and
"--option={0,1}"-style command line options.

Use enum.Enum subclasses instead of set literals to declare enumerations.

Use typing.List[T] instead of (list, T) to declare lists. (Note that a
minimal reimplementation of typing.List is used instead of the Python 2
backport of the typing module due to non-technical reasons.)

Use CheckedIPAddress instead of 'ip' and 'ip-local' to declare IP
addresses.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>

Add new knob() knob constructor. Keep the old Knob() constructor for
backward compatibility with old code.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>

Let IPAOptionParser handle parsing of its supported types and use an option
callback only for unsupported types.

Instead of parsing positional arguments manually, parse them using a custom
IPAOptionParser instance, reusing the option parsing code.

https://fedorahosted.org/freeipa/ticket/6392

Reviewed-By: Martin Basti <mbasti@redhat.com>