Add multiple schemas support for SMTP
Update code to use the new SMTP schema selection.
Move code to common.BaseConfig
Define abstract methods from BaseConfig.
Add changelog for #3403.
Merge remote-tracking branch 'ivan/feature/3403_add-support-for-multiple-schema' into develop
Define abstract methods from BaseConfig.
Add changelog for #3403.
Merge remote-tracking branch 'ivan/feature/3403_add-support-for-multiple-schema' into develop