promise: Merged check_free_disk_space and monitor_partition_space from @lisa.casino & @@xavier_thompson

collect data in slapos.core are stored into db with gmtime which was
different from utc used by monitor.

urlopen(url).read() returns bytes, this fixes:

      File "slapos.toolbox-repository/slapos/resiliencytest/suites/resiliencytestsuite.py", line 162, in _waitForCloneToBeReadyForTakeover
        while "<b>Importer script(s) of backup in progress:</b> True" in takeover_page_content:
    TypeError: a bytes-like object is required, not 'str'

errors with KVM resilience tests

Improved error text for misnamed InvalidSchema and MissingSchema exceptions.

https://github.com/psf/requests/blob/v2.27.0/HISTORY.md#2270-2022-01-03

See merge request nexedi/slapos.toolbox!102

The test doesn't care about the instance state, just wants an
 arbitrary instance title.

This promise relates to resources local on the partition, which are files, and
they shall be available fast, thus make it failing immediately in case of
failure.

See merge request nexedi/slapos.toolbox!100

If there is no url parameter the promise fails, so simply switch to empty.

The check_url_available promise has been improved with the following
changes:

- The `http_code` parameter has been renamed `http-code` for consistency.
- The `check-secure` parameter has been removed. Users should specify
  `http-code = 401` instead.
- The `username` and `password` parameters have been added to optionally
  enable HTTP basic authentication.
- The logging output has been changed slightly.

Accept unicode value for `port` parameter

pc.ram key is used for the initial memory, and it can't be removed.

This promise generalizes the check_port_listening promise to include
AF_UNIX sockets in addition to AF_INET and AF_INET6 host/port sockets.

The socket family and address is deduced from the set of arguments:
- `host` & `port`: AF_INET or AF_INET6
- `pathname`: filesystem pathname address for AF_UNIX
- `abstract`: '\0' is prefixed to build an abstract AF_UNIX address

All other combinations of arguments are forbidden.

The promise creates a socket accordingly and attempts to connect to the
provided address. The promise fails if the connection fails.

The check_port_listening promise has been removed.

See merge request nexedi/slapos.toolbox!97

This reverts commit 4a992aaa.

runpromise takes arguments from command line, but also read some from
a config file, so indeed it is mandatory to know partition_folder's
value, but it is not mandatory to pass it as an argument from the
command line

So instead of a traceback we get a better error message
written by argparse. Also , it will print a better help
message

On python3 several views were not functional, because subprocess output was
retrieved as bytes, but manipulated as a string.

This adds a few tests for views, not complete because it would be too much time
consuming for now.

See merge request nexedi/slapos.toolbox!94

Simple and predictable tool to resolve massively domain names to IPs.

See merge request !93