Added URI#ip_address?, determining if a URI contains an IP address or not.
Parser spec: added more tests for #extract_domain
Dispatcher: slight cleanup
Added RPC::Server::Instance#consumed_pids for debugging.
Utilities#generate_token: updated random max to 9999
Added Hash #stringify_keys and #symbolize_keys.
Added process helpers for RPC Instance and Dispatcher servers.

[Task #5275791205543]

Also, updated RSpec tests to use them and removed duplicate code.