use saved value for passwords, etc when validating plugin settings (#4399)
use saved value for passwords, etc when validating plugin settings (#4399)


JamesMura/sentry,gencer/sentry,JackDanger/sentry,looker/sentry,BuildingLink/sentry,mvaled/sentry,JackDanger/sentry,ifduyue/sentry,beeftornado/sentry,mvaled/sentry,alexm92/sentry,mvaled/sentry,zenefits/sentry,alexm92/sentry,gencer/sentry,ifduyue/sentry,gencer/sentry,looker/sentry,JamesMura/sentry,BuildingLink/sentry,JackDanger/sentry,JamesMura/sentry,mvaled/sentry,zenefits/sentry,JamesMura/sentry,alexm92/sentry,jean/sentry,beeftornado/sentry,jean/sentry,looker/sentry,looker/sentry,BuildingLink/sentry,ifduyue/sentry,zenefits/sentry,BuildingLink/sentry,JamesMura/sentry,beeftornado/sentry,gencer/sentry,looker/sentry,jean/sentry,ifduyue/sentry,mvaled/sentry,zenefits/sentry,gencer/sentry,jean/sentry,zenefits/sentry,jean/sentry,BuildingLink/sentry,ifduyue/sentry,mvaled/sentry