* config->exists returns true or false but no action taken and variable
is unused
* remove unused variable db_type
* remove unused variable db_name
* remove unused variable db_username
* remove unused variable db_password
* remove unused variable db_secure
* remove unused variable db_cert_authority
* remove unused variable db_host
* remove unused variable db_path
* remove unused variable db_port
* remove unused variable db. The upgrade method never uses the db variable
and instead uses a new database connection each time.
* remove uninitialized parameters variable
* domain_count never used
* variable context is never used in the method or any app_defaults
* variable $row is clobbered by inner foreach loop
* variable domain_name is never used in method scope
* variable domain_array seems to be uninitialized in this scope so set an
empty string value so function lower_case is not receiving null.
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