Update submodules: plugins (new commits)

plugins:
    0c7a17b Chris Smith <chris@dmdirc.com>
            Remove ValidatorChain varargs usages.

            Gerrit: http://gerrit.dmdirc.com/3170

Change-Id: I11c842ab223b2a6be345f7d192d26df703eb0e7d
Update submodules: plugins (new commits)

plugins:
    cdcbd86 Greg Holmes <greg@dmdirc.com>
            Remove some warnings

            Gerrit: http://gerrit.dmdirc.com/3171

Change-Id: I25545ca3629a5c2a47ffc666365e8a745e804c51