Added several configuration files for newly introduced client on-boarding feature set.

Main configuration files to specify on-boarding scenarios, available devices, on/off switches, etc.:
client-onboarding-scenarios.yml
client-onboarding.properties


On-boarding settings for CalDAV and CardDAV:
client-onboarding-caldav.properties
client-onboarding-carddav.properties


On-boarding settings for Drive App:
client-onboarding-driveapp.properties


On-boarding settings for EAS:
client-onboarding-eas.properties


On-boarding settings for eM-Client:
client-onboarding-emclient.properties


On-boarding settings for mail (IMAP/POP3 & SMTP):
client-onboarding-mail.properties


On-boarding settings for Mail App:
client-onboarding-mailapp.properties


On-boarding settings for Android Sync App:
client-onboarding-syncapp.properties