The argparse module automatically replaces '-' characters with '_'
characters when converting an option string to an attribute:

«For optional argument actions, the value of dest is normally inferred
from the option strings. ArgumentParser generates the value of dest by
taking the first long option string and stripping away the initial --
string. If no long option strings were supplied, dest will be derived
from the first short option string by stripping the initial - character.
Any internal - characters will be converted to _ characters to make sure
the string is a valid attribute name.»[1]

This means that the value of the "--remote-region" option of the
"image-import" command will be available as "args.remote_region";
"remote-region" would not be a valid attribute anyway.

We make sure to retrieve the proper value for the following
options: --remote-region, --remote-image-id and
--remote-service-interface.

[1] https://docs.python.org/3/library/argparse.html#dest

Change-Id: I1d8c69acd5d61fdc426469cd87d1ace81871e60f
Partial-Bug: #2012442

First, fix test_help(). A commit[1], which first appeared in Python
3.10, changes the output of the help feature of argparse. Options used
to be in a section named "Optional arguments:", and they are now in a
section named "Options:".

Second, tox 4 changes the behaviour of tox, and
{toxinidir}/requirements.txt is no longer installed automagically in the
docs virtual environment. This causes autodoc to fail on some imports.
We explicitely add {toxinidir}/requirements.txt to the list of
dependencies to fix this issue.

These issues should be fixed in separate patches, but since they both
block the CI, they depend on each other.

[1] https://github.com/python/cpython/pull/23858

Change-Id: Ia7866390b31f469bdea95624325a13aaf45a496e
Closes-Bug: #2002566

Boolean options (such as "--protected" for glance md-namespace-update)
should accept a limited amount of valid values, rather than assuming an
"invalid" value means "False".

The following values (no matter the case) will now be interpreted as
True: ‘t’,’true’, ‘on’, ‘y’, ‘yes’, or ‘1’.

The following values (no matter the case) will now be interpreted as
False: ‘f’, ‘false’, ‘off’, ‘n’, ‘no’, or ‘0’.

Change-Id: I0e7942045d883ac398bab4a7a85f2b4ac9b1ed8c
Closes-Bug: #1607317

The value of DEFAULT_PAGE_SIZE (20) was hardcoded in multiple places in
the tests, which means all the tests would break should we ever want to
change that value.

Co-Authored-By:	韩春蕾 <1922361860@qq.com>

Change-Id: I6e8dbae32c3a24d3fbeebcea5bfe0dd9ae247035

This commit:
- removes the old "u" prefix from all strings
- removes the unicode_key_value_to_string function

Change-Id: I1da347e31e828fd2359f0935a4da47257116d4cb

The schema_args decorator generates command line options based on the
properties defined in a schema. This commit makes sure read-only
properties are skipped during this process, since trying to modify their
value would result in a Glance error.

Closes-Bug: #1561828
Change-Id: I7ccc628a23c9ebdaeedcb9e6d43559f497ce9555