Update callers of wrs_shm_get_and_check to recognize return value
WRS_SHM_INCONSISTENT_DATA. Update to use defined values instead of numbers.

Update:
--snmpd
--tools/rtu_stat
--tools/wr_mon
--tools/wr_phytool
--tools/wrs_sfp_dump
--tools/wrs_vlans
--wrs_watchdog
--wrsw_rtud
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>