invoke error callback on last failed connection attempt
invoke error callback on last failed connection attempt

Change-Id: Ica9b1376406ba000cacb2afe9af210fe7f6e6554
Signed-off-by: Alessandro Salvatori <8a0c874bf01335702b42d6983c4d9b3eb550c634@gmail.com>

mhrobinson/opflex,mhrobinson/opflex,mhrobinson/opflex,opendaylight/opflex,mhrobinson/opflex,opendaylight/opflex,opendaylight/opflex,opendaylight/opflex