Revert "Made port numbers use portno_t."

This reverts commit 206745d4de20363c13574930b8bf9248d06710f0.

Conflicts:

	src/clustering/administration/main/command_line.cc
	src/http/json/json_adapter.cc
	src/http/json/json_adapter.hpp
	src/unittest/test_cluster_group.cc
Revert "Made portno_t be serializable."

This reverts commit 558449d08b06279c3eae96619c620fdb74b6e430.
Revert "Added unused type portno_t in utils.hpp."

This reverts commit a29726955a74e325f0b4495c13cdb6492cd5b7a9.