Convert IPsec tests to JUnit4

This patch fixes an incompatibility where some tests in the same
hierarchy were using Junit3, and other Junit4

No functional test changes made

Bug: 72950854
Test: Ran on devices, working
Change-Id: I79d231e202ba25ad5f57b44b387bebd7f012aa95
3 files changed
tree: 286c7255eabb3bc9bc84f2ab6ea728b684eef268
  1. tests/