Fixed SNMP_ERR_TOOBIG handling for bulk walk operations
Merge branch '5.4' into 5.5

* 5.4:
  Fixed SNMP_ERR_TOOBIG handling for bulk walk operations
Fixed SNMP_ERR_TOOBIG handling for bulk walk operations. (Boris Lytochkin)
Merge branch '5.5' into PHP-5.5

* 5.5:
  Fixed SNMP_ERR_TOOBIG handling for bulk walk operations. (Boris Lytochkin)