We are inconsistent with some other projects with hiding client help
output for commands added with microversions by default. This often
leads to confusion with users of the CLI not being aware of these
changes.

This changes the default to display all help output. Users can still
specify a version and have the output limited to include only options up
to the version they specify.

Change-Id: I39d90a1ecc824fcf445e98609de47d45e71a0ff6
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

Specifying size is not required while providing --backup-id.
Also When we don't provide the size the output turns out to be
error: Size is a required parameter if snapshot or source
volume or backup is not specified.
which should be modified in 'size' info too.

Change-Id: Ia250df37db9170757d5f834d516781e04582f08b

IETF RFC 3986 classifies "~" as a reserved character [1],
however until python3.7 [2], python's url parsing
used to encode this character.

urllib has seen a lot of churn in various python
releases, and hence we were using a six wrapper
to shield ourselves, however, this backwards-incompatible
change in encoding norms forces us to deal with
the problem at our end.

Cinder's API accepts "~" in both, its encoded
or un-encoded forms. So, let's stop encoding it
within cinderclient, regardless of the version
of python running it.

Also fix an inconsitency around the use of the
generic helper method in utils added in
I3a3ae90cc6011d1aa0cc39db4329d9bc08801904
(cinderclient/utils.py - build_query_param)
to allow for False as a value in the query.

[1] https://tools.ietf.org/html/rfc3986.html
[2] https://docs.python.org/3/library/urllib.parse.html#url-quoting

Change-Id: I89809694ac3e4081ce83fd4f788f9355d6772f59
Closes-Bug: #1784728