IDEX-1680 Discover datasource, clean up Datatype enum, removing
constants as much as possible

Task-Url: https://jira.codenvycorp.com/browse/IDEX-1680
IDEX-1680 Discover datasource, allow dash character in the edit
datasource wizard
Task-Url: https://jira.codenvycorp.com/browse/IDEX-1680
IDEX-1680 Discover datasource: Add runner process Id to datasource
configuration DTO
Task-Url: https://jira.codenvycorp.com/browse/IDEX-1680
IDEX-1680 Datasource discovery, add default password to enum Datatype
Task-Url: https://jira.codenvycorp.com/browse/IDEX-1680
IDEX-1680 Datasource discovery, DatasourceManagerPrefImpl will not
persist auto generated datasources (checking presence of
runnerProcessId)

Task-Url: https://jira.codenvycorp.com/browse/IDEX-1680
IDEX-1680 Datasource discovery, Adding the service to discover
datasources 

Task-Url: https://jira.codenvycorp.com/browse/IDEX-1680