liblog: require root for multi_connect_dgram_socket test

Bug: 65062446
Test: multi_connect_dgram_socket is skipped for non-root
Test: multi_connect_dgram_socket passes for root
Merged-In: I610bed5987580e0c5a01952efc2e32e7d8cdf9b4
Change-Id: I610bed5987580e0c5a01952efc2e32e7d8cdf9b4
(cherry picked from commit 710825ce)