config: make foreign_master_threshold configurable

For compliance with 802.1AS foreign_master_threshold must be set to 1
this patch makes it configurable leaving the default to 2 which was
the previously hardwired value.

Signed-off-by: Delio Brignoli <dbrignoli@audioscience.com>
port: postpone peer delay calculation until nrr is valid

Signed-off-by: Delio Brignoli <dbrignoli@audioscience.com>
Merge remote-tracking branch 'origin/asi1230-upstream-tracking' into asi1230-master