sp-flag related changes: sp-flag bit is set in DLNA.ORG_FLAGS only when the content is a strict live where s0=sN. The other live streaming scenario related to TimeShiftBuffering and In-progress recording sp-flag is not set.
sp-flag related changes: Connection stalling and background transfer mode bit is disabled in DLNA.ORG_FLAGS when enabling sp-flag for strict live where s0=sN. Connection stalling and Background transfer mode flags are set only when sp-flag bit is not set.
Merge branch 'cablelabs/master' into cbl_parthi/spFlagChanges
Completed the sp-flag support

Also enhanced the MediaResource.to_string() to include pseudonyms for the
 DLNA flags and operation modes.
Merge branch 'cbl_parthi/spFlagChanges' into cablelabs/master