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

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);
 }