[xcvrd] Subscribe port configuration change in xcvrd (sonic-net#212)

Author: Junchao-Mellanox

.gitignore

@@ -16,4 +16,8 @@ sonic-psud/scripts/psudc
 # Unit test / coverage reports
 coverage.xml
 .coverage
-htmlcov/
+htmlcov/
+test-results.xml
+leddc
+pciedc
+syseepromdc