Broken Kerberos proxy integration

[bryanmcnulty]

The proxy integration (via "github.com/oiweiwei/go-msrpc/dcerpc".dcerpc.WithDialer) is ineffective in 0.2.0. This is likely rooted in a change in go-msrpc between v1.2.5 and v1.2.7.

v0.1.2 is unaffected