added ping and snmp ignore as default to /Server/RDS; replaced datetime.datetime.now with datetime.datetime.utcnow
fixed limitation on aws zone
Merge branch 'master' of https://github.com/cascadeo/ZenPacks.Cascadeo.ZenRDS
Merge branch 'master' of https://github.com/cascadeo/ZenPacks.Cascadeo.ZenRDS