(BKR-960) Skip timesync for ciscoxr-64a
(BKR-960) Skip timesync for ciscoxr-64a

BKR-960 is a beaker bug where the timesync helper method doesn't support cisco xr ios.
As a workaround, this commit just skips timesync for that platform.
This leaves the tests at risk of failing due to clock differences, but allows the tests to complete otherwise.

[skip ci]

puppetlabs/pxp-agent,puppetlabs/pxp-agent,puppetlabs/pxp-agent