…signed()

Quite often we just want to subtract two normal usec_t values, hence
provide an implementation for that.

…en clocks

We use that quite often, let's implement one clean version of it.

…_clock()

Let's use the generic clock shifting logic here.

This reworks timer_enter_waiting() in a couple of ways in order to clean
it up a bit and fix systemd#5629.

Most importantly, we previously we initialized ts_monotonic to either
the current time in CLOCK_MONOTONIC or in CLOCK_BOOTTIME, depending on
t->wake_system. Then given specific conditions we'd use this time as
base for our timers. And afterwards, if t->wake_system was on we'd
convetr the resulting value from CLOCK_MONOTONIC to CLOCK_BOOTTIME again
— which of course is wrong since we already were in CLOCK_BOOTTIME! This
fixes this logic, by using a triple timestamp so that we always have the
right base around, and initially only calculate in CLOCK_MONOTONIC and
only convert as last step.

Conversion between the clocks is now done with the generic
usec_shift_clock(), and additions via usec_add() making these
calculations a bit safer.

Fixes: systemd#5629

…time

When debugging time issues its kinda handy to have an easy way to query
the three clocks, hence let's just output them at the beginning of
test-time.