Closes T432
Closes T457
Related D54

Closes T433

Also keep the test up-to-date with the changes

Change those arguments in order to keep up with objstorage new version.

Keep up with the changes of pathslicing objstorage.

Example, for "abcdef1234567890" with slicing "0:2/0:5", path will be "root/ab/abcde/".

Also, update pathslicing objstorage tests to follow those changes

Summary:
This bug is in the asynchronous code and is **not** related to T436
Ref T401

Reviewers: #reviewers

Maniphest Tasks: T401

Differential Revision: https://forge.softwareheritage.org/D46

Ref T433

Also add a mixin test class for the contract verification.

When ran as daemon, the checker run forever in background. When not as daemon, it only check for a single random batch of content.
That could allow the checker to run as multiple one-shot with a cron.

Update the setup.py file in order to add the new created directory 'swh/storage/checker'

Add a test that verify if the content integrity checker can repair the files if the content is exclusively distributed among multiple servers.

The config file now allows the syntax
  backup_url=url1, url2, url3, ...

This allows to have more than one server to contact in case of
corrupted content.

This bug wasn't caught by the phabricator's test runs.

Reviewers: #reviewers

Differential Revision: https://forge.softwareheritage.org/D34

Closes T423

- restore_bytes method is needed to repair a content as the add_bytes methods does nothing to the content if the id is already in the file system
- get_random_contents is used for the content integrity checker in order to have a stateless probabilistic method for the cerification scheduling

This is the main function used when deployed

Object storage and storage http servers now have the same --help description.
Also, add a security check for argument type of the port that must be an int.
Ref T402

With click module, the archiver can now be launched in cl, e.g. by cron.
Ref T240

Closes T404

Reviewers: #reviewers, ardumont

Differential Revision: https://forge.softwareheritage.org/D28

Closes T403

Summary:
	Ref T401

	- Fix : The 'ongoing' status wasn't set to the content that were supposed to be
in que archival queue.
	- Refactor :
		- Extract sql query from archive worker and place it into db module
		- Refactor in order to improve code quality & separation and to  simplify unit testing.
		- Change the way the director's configuration is stored to make it easy to send the whole config to ArchiverWorker

Reviewers: #reviewers

Maniphest Tasks: T401

Differential Revision: https://forge.softwareheritage.org/D27

The content status wasn't correclty set to 'ongoing'.

The 'ongoing' status wasn't set to the content that were supposed to be
in que archival queue.

Summary:
Use click in order to improve the routine.
Closes T402

Reviewers: #reviewers, ardumont

Maniphest Tasks: T402

Differential Revision: https://forge.softwareheritage.org/D26