control/controlhttp: factor out some code in prep for future change

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This pulls out the clock and forceNoise443 code into methods on the
Dialer as cleanup in its own commit to make a future change less
distracting.

Updates #13597

Change-Id: I7001e57fe7b508605930c5b141a061b6fb908733
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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