Bug#1051582: Policy 9.3 (Starting system services) is largely obsolete

[Santiago Vila <sanvila@debian.org>]

I wrote:
> I believe that by choosing the wording appropriately, we can still keep this
> desired property of Policy while still not mandating any given implementation.

Sorry, that was terribly worded. I meant that we can avoid the hassle of
documenting everything dh_installsystemd does and at the same time not
*formally* mandating the use of dh_installsystemd.

Thanks.