cronet: rename CronetCtsTestServer to HttpCtsTestServer am: 63863bf446

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2388909

Change-Id: If2e6483dee0e416e2f0094ff84f0b30e3e5d204c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>