CTS: Verify rekey-based tunnel migration with encapType change

Adds CTS to verify that the tunnel migration based on replacing
SAs can handle changes of encap type.

Verified on kernel 5.10.149 and 5.10.104

Bug: 266149275
Test: atest IpSecManagerTunnelTest(new tests added)
Change-Id: I33e945f8be2a472603c5f1b64697f62f2d69a186
1 file changed