code: @Nonnull
      public String changeJvmRoute( @Nonnull final String sessionId, @Nonnull final String newJvmRoute ) {
          return stripJvmRoute( sessionId ) + "." + newJvmRoute;
      }
docs: Change the provided session id (optionally already including a jvmRoute) so that it
  contains the provided newJvmRoute.
  
  @param sessionId
  the session id that may contain a former jvmRoute.
  @param newJvmRoute
  the new jvm route.
  @return the sessionId which now contains the new jvmRoute instead the
  former one.