dhcp-4: fallback to CLOCK_MONOTONIC for timerfd
RHEL7 supports clock_gettime(CLOCK_BOOTIME), but it does not support timerfd_create(CLOCK_BOOTIME). Fallback to CLOCK_MONOTONIC.
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RHEL7 supports clock_gettime(CLOCK_BOOTIME), but it does not support timerfd_create(CLOCK_BOOTIME). Fallback to CLOCK_MONOTONIC.