feat(infra): update 3n-alt ipsec tests

feat(infra): update 3n-alt ipsec tests

Remove 4 tunnel flow cache test cases, as those don't benefit from flow
cache much.
Add mrr ipsec test cases for the XL710 Intel NIC to increase coverage.
Don't add ndrpdr for XL710, only add commented out counterparts to
align with the mrr list.
Also modify the existing flow cache configuration by adding the fast
path config as well. These are independent features, but the fast path
code added this dependency.

Change-Id: Ide88fd8c1abe96c577a86925dcc2dc4e63f897d4
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>