Changes to issue: MIFOSX-949
MIFOSX-949 cleaning up db upgrades and externalizing remaining properties
Update CHANGELOG.md

to add a note that for users updating to latest version on dev branch, an sql patch needs to be run on mifosplatform-tenants schema
adding tenant schema migration patch for flyway
deleting duplicate update scripts for tenant schema
Update CHANGELOG.md

with new link to sql patch file