fix for BUG 760 (provided configs)

- added unpacking of xml from resources to target/provided-configs
- limited to artifactIds: openflowplugin-controller-config
- copied content of target/provided-configs to opendaylight/configuration/initial by assembly-plugin
- changed execution id in pom to match id of execution with the same purpose in distribution/services

Change-Id: Ice4247682ae53576146b8f0f61ebc9599c35b6a8
Signed-off-by: Michal Rehak <mirehak@cisco.com>