Exit with appropriate return codes on failures

A number of systems expect a non-zero exit code on failure
For restart, we care about the status of start
add doc on moving mysql to postgres
add mysql-postgresql-converter submodule, and updated document
 Merge branch 'centos-init-exitcode' into 'master'

Centos Init Exitcode

Exit with appropriate return codes on failures

A number of systems expect a non-zero exit code on failure
For restart, we care about the status of start
 Merge branch 'add/migratemysql' into 'master'

Documentation on migrating from mysql to postgresql

First draft on migration of database from mysql to postgresql

Any input would be great