There's a race between systemd-timesyncd manipulating the system time (with NTP
lookups) and the test case's time manipulation. Prevent this by stopping
systemd-timesyncd for the duration of the test case.
Thanks to Khem Raj for root-causing this.
(From OE-Core rev: 5334f1b1e9363fa9c128289b51ade55c7ae1a0a3)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>