Use odlparent as parent POM.

  * maven-checkstyle-plugin 2.12 is still used for strict indentation
    check.

Other changes:

  * manager: Fixed incorrect javadoc link in unit test.
  * coordinator: Upgrade Apache Tomcat to 7.0.56.

Change-Id: I08dade0dd8c9054b6caf89f247a82cb6d3df5890
Signed-off-by: Shigeru Yasuda <s-yasuda@da.jp.nec.com>