[VOL-2404] : RW-Core changes for handling OLT Reboot Scenario

- When the OLT's connection status goes from REACHABLE to UNREACHABLE
  in ENABLED/DISABLED admin state, delete all the logical ports,
  child devices, logical device and device flows.

- When OLT's connection status becomes reachable again, child devices,
  ports will be re-discovered again. The logical device will be recreated
  again.

- Will not handle the case where OLT goes UNREACHABLE when OLT is disabled
  as part of voltha2.3 release

Change-Id: I34c0c538b44afa19e889e9631f0a738060a58fef
diff --git a/.gitignore b/.gitignore
index 8ae7909..9a6c87e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,3 +56,9 @@
 # test output
 tests/results
 sca-report
+
+# CPU profile
+**/profile.cpu
+
+# etcd - ?
+rw_core/core/voltha.rwcore.nb.etcd/