ntpd: decrease INITIAL_SAMPLES from 4 to 3

This reduces initial traffic to NTP servers when a lot of devices boot at once.

Log inspection tells me we agressively burst-poll servers about 5 times
at startup, even though we usually already update clock after second replies.
INITIAL_SAMPLES can probably be even lower, e.g. 2, but let's be conservative
when changing this stuff.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

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