Update submodules: plugins (new commits)

plugins:
    2be4d54 Chris Smith <chris@dmdirc.com>
            Revert dagger change.

            The way we include dependencies/build the classpath means dagger ends
            up on the path twice, which causes problems.

            Will have to do this when the build process isn't horrifically horrible.

            Gerrit: http://gerrit.dmdirc.com/2743

Change-Id: I442d4181239fc5fb41ff31ae3fcd5d8c8507927a