Remove unused INetworkManagementService from IpSecService

IpSecService is no longer using any methods of
INetworkManagementService, so remove it from IpSecService
and related files.

Bug: 170598012
Test: atest FrameworksNetTests
Change-Id: I852e3a534e0ffd26b4b22420754f3ec8a6f153ad
3 files changed
tree: 2936de46c3ae7a72d2fe5cc9052eab07f0ffe199
  1. core/
  2. framework/
  3. service/
  4. services/
  5. tests/
  6. OWNERS