Fixes in test_drop_counters.py#1610

Merged

lguohan merged 2 commits intosonic-net:masterfrom

yvolynets-mlnx:drop_count_test_fix

Apr 30, 2020

Commits on Apr 24, 2020

Fixed vlan test, skipped loop-back filter test.
yvolynets-mlnx
committed

Commits on Apr 30, 2020

Added usage of 'wait_until' instead of loop
yvolynets-mlnx
committed