(#6985) Allows indirectors to accept a hash as an argument.

Many indirectors need to take a hash as the last argument.
This was not allowed b/c the last hash argument was assumed to
be the options hash.
I resolved this by assuming that the hash needed by an indirector
would be the same as the options hash.

Reviewed-By: Daniel Pittman <daniel@puppetlabs.com>