Update submodules: plugins (new commits)

plugins:
    602047c Chris Smith <chris@dmdirc.com>
            Add dagger as a dependency.

            Remove the big block of commented out stuff I forgot about.

            Gerrit: http://gerrit.dmdirc.com/2742

Change-Id: Ide1298e7c828861ac486665195aa86bcdcb84c4f