[intfmgrd] Fix intfmgrd hanging untill first interface becomes ready (sonic-net#748)

intfmgrd can hang on first interface it tries to configure untill this
interface becomes "ready". This delays other interfaces configuration to
be processed.
This commit fixes this issue by skiping "not ready" interface and
proceed with others. Skipped interface can be processed on next
iterations.

Signed-off-by: Stepan Blyschak <[email protected]>

Author: stepanblyschak

cfgmgr/intfmgr.cpp

@@ -246,13 +246,15 @@ void IntfMgr::doTask(Consumer &consumer)
         {
             if (!doIntfGeneralTask(keys, data, op))
             {
+                it++;
                 continue;
             }
         }
         else if (keys.size() == 2)
         {
             if (!doIntfAddrTask(keys, data, op))
             {
+                it++;
                 continue;
             }
         }