PostgreSQL support (#932)

* PostgreSQL support

Signed-off-by: Andrey Voronkov <avoronkov@enapter.com>

* Add Enapter (c) to licenses.

Signed-off-by: Andrey Voronkov <avoronkov@enapter.com>

* Remove PostgreSQL dockerfiles and generator

Signed-off-by: Andrey Voronkov <avoronkov@enapter.com>

* Add ENAPTER license header to the valid headers list.

Signed-off-by: Andrey Voronkov <avoronkov@enapter.com>

* Fix sp_rollout table boolean value

Signed-off-by: Andrey Voronkov <avoronkov@enapter.com>

hawkbit-runtime/hawkbit-update-server/src/main/resources/application-postgresql.properties

@@ -0,0 +1,18 @@
+#
+# Copyright (c) 2020 Enapter Co.,Ltd.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Eclipse Public License v1.0
+# which accompanies this distribution, and is available at
+# http://www.eclipse.org/legal/epl-v10.html
+#
+
+# This profile adds basic configurations for a PostgreSQL usage.
+# Keep in mind that you need the PostgreSQL driver in your classpath on compile.
+# see https://www.eclipse.org/hawkbit/guides/runhawkbit/
+
+spring.jpa.database=POSTGRESQL
+spring.datasource.url=jdbc:postgresql://localhost:5432/hawkbit
+spring.datasource.username=postgres
+spring.datasource.password=
+spring.datasource.driverClassName=org.postgresql.Driver