Some parameters have measure unit included in label. We might receive more tickets like #2444 or #2437 to add measure unit to some parameters.

I propose to introduce new parameter's attribute: 'measure_unit' and move there all occurrences of measure units from labels. Client applications would then decide where and when to display measure units.

Benefits:
- labels won't be polluted with measure units
- change in plugin will update both CLI and Web UI or other client

Current:

Int('krbmaxpwdlife?',
    cli_name='maxlife',
    label=_('Max lifetime (days)'),
    doc=_('Maximum password lifetime (in days)'),
    minvalue=0,
),

Proposed:

Int('krbmaxpwdlife?',
    cli_name='maxlife',
    label=_('Max lifetime'),
    doc=_('Maximum password lifetime (in days)'),
    measure_unit:_('days'),
    minvalue=0,
),