Bridge mac setting, fix statedb time format (#1844)

*Set bridge mac same as Vlan mac
*Format state_db entries to have six digit precision for microseconds

Author: prsunny

cfgmgr/vlanmgr.cpp

@@ -196,7 +196,8 @@ bool VlanMgr::setHostVlanMac(int vlan_id, const string &mac)
     // The command should be generated as:
     // /sbin/ip link set Vlan{{vlan_id}} address {{mac}}
     ostringstream cmds;
-    cmds << IP_CMD " link set " VLAN_PREFIX + std::to_string(vlan_id) + " address " << shellquote(mac);
+    cmds << IP_CMD " link set " VLAN_PREFIX + std::to_string(vlan_id) + " address " << shellquote(mac) << " && "
+            IP_CMD " link set " DOT1Q_BRIDGE_NAME " address " << shellquote(mac);
 
     std::string res;
     EXEC_WITH_ERROR_THROW(cmds.str(), res);

orchagent/muxorch.cpp

@@ -1300,7 +1300,17 @@ void MuxCableOrch::updateMuxMetricState(string portName, string muxState, bool s
     char buf[256];
     std::strftime(buf, 256, "%Y-%b-%d %H:%M:%S.", &now_tm);
 
-    string time = string(buf) + to_string(micros);
+    /*
+     * Prepend '0's for 6 point precision
+     */
+    const int precision = 6;
+    auto ms = to_string(micros);
+    if (ms.length() < precision)
+    {
+        ms.insert(ms.begin(), precision - ms.length(), '0');
+    }
+
+    string time = string(buf) + ms;
 
     mux_metric_table_.hset(portName, msg, time);
 }