userspace/snmpd: add portSfpID, portSfpInDB and portSfpGbE

Add to snmp:
-portSfpID - PN of SFP inserted into switch port
-portSfpInDB - report if inserted SFP is in data base
-portSfpGbE - report if inserted SFP is 1GbE, note only 1GbE are supported by
              FPGA

update wrs_dump_shmem to display portSfpInDB and portSfpGbE flags.
Update MIB.
Fix typo in MIB file (ppsiGrandmaterID -> ppsiGrandmasterID)

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>