Add/remove internal addresses from IpSecTunnelInterface

This change corrects a bug where IpSecTunnelInterface was not removing
old addresses, and resulted in EEXIST when trying to re-add an address
to a given interface.

Test: atest FrameworksVcnTests
Change-Id: I43434c801354483a7c7d0092891799bf86da23eb
3 files changed