Ignore other IKE options if IkeTunnelConnectionParams is set

Stop parsing the IKE options from the input IkeTunnelConnectionParams
if exists. The caller shuould get the relevant infortation the
params.

The field is also stored in the VpnProfile if it built from an
Ikev2VpnProfile.

Bug: 184750836
Test: atest FrameworksNetTests HostsideVpnTests
Test: build ; flash ; connect VPN successfully
Change-Id: Id05c17285915462c7a6cd51d5fb4ee5da7f465ba