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URL typo.
Standardize on bytes internally to _log_invocation
New password obfuscation in syslog messages that:
* makes speed acceptable for some datasets
* obfuscates multiple detected passwords
* obfuscates more characters to account for some corner cases when
  trying to detect passwords.

Fixes #8364
Unittests to detect speed regressions in password obfuscation and that
the passwords are correctly hidden in the output.
Reduce commenting as basic.py is copied to the remote host with every module transfer.

Move some comments to the unittest as we might look at that if we decide
to refactor the code.
Don't re-add galaxy deps if they've already been added for install

Fixes #8890
Disable custom https handler for fetch_url on older pythons

Fixes #8898
Re-allow templating of complex_args, but count params to prevent injection

Fixes #8810
LinuxService: check properly if systemd is running

Use a pure Python reimplementation of the [sd_booted(3)][1] function
from [systemd v210][2].

[1]: http://www.freedesktop.org/software/systemd/man/sd_booted.html
[2]: http://cgit.freedesktop.org/systemd/systemd-stable/tree/src/libsystemd/sd-daemon/sd-daemon.c?id=v210#n465
Transform comment into docstring
LinuxService: use the same logic as systemd for appending .service to an unit

There's no need for complex rules to determine if `.service` should be
appended to a unit's name, just do like systemd does.  For more details
see commit [696c245a23d55e4249651573eb9c61b68e61580c][1] and
[`unit_name_mangle`][2] from systemd.

[1]: http://cgit.freedesktop.org/systemd/systemd/commit/?id=696c245a23d55e4249651573eb9c61b68e61580c
[2]: http://cgit.freedesktop.org/systemd/systemd/tree/src/shared/unit-name.c?id=696c245a23d55e4249651573eb9c61b68e61580c#n501
LinuxService: check properly if systemd manages the unit

There's no need to list and look at all the unit files, just check the
[load state][1] of the current unit by running `systemctl -p LoadUnit show`.

This also covers cases like when an unit is masked (which means that
systemd can't start or enable it).

[1]: http://cgit.freedesktop.org/systemd/systemd-stable/tree/src/shared/unit-name.c?h=v208-stable#n52
LinuxService.get_service_tools: check for systemd first

Check for systemd first then for legacy init systems. This simplifies
the code.
LinuxService: d.get(k, None) -> d.get(k)

From the documentation:
> D.get(k[,d]) -> D[k] if k in D, else d.  d defaults to None.

So there's no need for the `None` parameter.