Makefile, e2e/*: Add end to end tests

Tests are using kind, adjacency and bash_unit.

A kind cluster is spun up and the previously build container image of
Kilo is loaded into it.
Adjacency and a curl container is started.

From the curl container a http request is send to the adjacency service.

The test fails if curl returns an unexpected result.

Two test are run. One with `mesh-granularity=full` and `location`.

The e2e test is only run for pull request because it is a bit flaky for
automatic nightly runs.

Signed-off-by: leonnicolas <leonloechner@gmx.de>

e2e/kind-config.yaml

@@ -0,0 +1,9 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+- role: worker
+- role: worker
+networking:
+  disableDefaultCNI: true # disable kindnet
+  podSubnet: 10.42.0.0/16