SFP supports hard/idle timouts w/drawback of needlessly sending flow_del to...

SFP supports hard/idle timouts w/drawback of needlessly sending flow_del to switch (which gets silently discarded). This is a good first step but needs to be followed up with a solution to the redundant flow_del msg. Also, patched MatchSerializer to display masks if present and fixed a bug in OFInstructionListSerializer for metadata and goto_table instructions. Added masking support to all SFP match fields. OVS supports some masked fields that are not defined in the OF1.3 spec. Oddly enough, OVS returns a bad-match error message even though the flow gets inserted. I suppose that message is due to the OF protocol not supporting it. OVS should squelch it if it supports it though. In any case, Floodlight is equipped to support all present MatchFields as masked MatchFields in the future. To specify a mask to any field (beside MPLS BOS, which is a boolean), use a CIDR-style '/' after the value and before the mask. All values and masks support decimal or hexadecimal (with leading '0x'), with the exception of all values that are MacAddress or IPAddress types -- they only support hex-string or dotted-decimal, respectively. Lastly, an English typo has been fixed in IStaticFlowEntryPusherService.