Test remotely initiated rekey

This commit:
- Adds test for remotely initiated rekey for IKE and Child SA
- Makes IkeTunUtils support building and injecting requests
- Adds method to parse hex to long because Long.parseLong cannot
  handle negative long value

Bug: 155821007
Test: atest CtsIkeTestCases
Change-Id: I299cf190261ac15397f9ed389adb2c69e94a6507
Merged-In: I299cf190261ac15397f9ed389adb2c69e94a6507
(cherry picked from commit a5bff5a7b46c31dfa4ae692328edfb2b2a6462c8)
4 files changed
tree: 84e4d87050d5bb5a3f78f52fe427ae4dd933fc07
  1. tests/