test: Reduce length of log filenames

With some filesystems (e.g., ecryptfs), the maximum filename length is
lower than 255, that of ext4.  On these filesystems, the tests fail with
the following error because log filenames are too long:

    K8sPolicyTest Basic Test Redirects traffic to proxy when no policy is applied with proxy-visibility annotation Tests HTTP proxy visibility without policy
    at /cilium/cilium/test/ginkgo-ext/scopes.go:430

    [Could not read monitor log
    Expected
        <*os.PathError | 0xc000e1fec0>: {
            Op: "open",
            Path: "test_results/117-/K8sPolicyTest_Basic_Test_Redirects_traffic_to_proxy_when_no_policy_is_applied_with_proxy-visibility_annotation_Tests_HTTP_proxy_visibility_without_policy/monitor-13f3cf9b-4f30-11ea-b222-60f262b6c493.log",
            Err: 0x24,
        }
    to be nil]

This commit updates the name of the test (from which the log filename is
derived) to be consistent with other tests' names.

Signed-off-by: Paul Chaignon <paul@cilium.io>

test/k8sT/Policies.go

@@ -792,7 +792,7 @@ var _ = Describe("K8sPolicyTest", func() {
 			})
 		})
 
-		Context("Redirects traffic to proxy when no policy is applied with proxy-visibility annotation", func() {
+		Context("Traffic redirections to proxy", func() {
 
 			var (
 				// track which app1 pod we care about, and its corresponding