[Plugin] Make command output size limiting obvious

When command output is size limited it should be made obvious that it is
not the whole output of the command, beyond the collected output (most
likely) starting in the middle of a string.

To do this, we add a 'truncated' key to the results dict returned by
`sos_get_command_output()`, which is set based on if the `AsyncReader`
was filled during command execution.

From that, first log if a command was truncated. Second, instead of
dropping the collected output in the normal plugin directory, instead
drop it into `sos_strings` with a `.tailed` extention to mimic how we
handled tailed file collections. Finally, add a symlink from the plugin
dir with the original filename that points to the `sos_strings` path.

Closes: #1332
Resolves: #2506

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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