move plugins from deps to optionalDeps (#2023)
move plugins from deps to optionalDeps (#2023)

plugins really are optional, so declare them that way
haraka/Haraka,smfreegard/Haraka,smfreegard/Haraka,smfreegard/Haraka,msimerson/Haraka,haraka/Haraka,smfreegard/Haraka,msimerson/Haraka,haraka/Haraka,msimerson/Haraka,haraka/Haraka,msimerson/Haraka