IpSecManager and its associated classes are removed from OC.
They are planned for a future release.
Bug: 37681043
Test: make cts
Change-Id: I2ff911d5c62dbbf9be699330742d041706d9cbc2
Merged-In: I2ff911d5c62dbbf9be699330742d041706d9cbc2
(cherry picked from commit 3a51173a3a762b576dd3c0d29c883e8763a9f95b)