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Use RFC 5737 IP addresses and RFC 2606 domain names in all
unittests, docs, qa and docstrings.
Signed-off-by: Manuel Franceschini <livewire@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

This patch moves network utility functions to a dedicated module.
Signed-off-by: Manuel Franceschini <livewire@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Manuel Franceschini <livewire@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

This also updates a comment in the unittest for utils.py. We unittest
the new function for two things: correct reporting on real case (for
localhost), and correct reporting with a mocked-out TcpPing that returns
false.
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Certificates and keys generated using these functions will be used for
inter-cluster instance moves. As per design, the private key should never
leave the node.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>