Combine provisioning code for tests and improve logging

Merge from Widevine repo of http://go/wvgerrit/169018

This CL adds a provisioning holder that attempts to
provision and logs the request and response for
failures. The server team can replay the request to debug
problems on their end.

Bug: 276464340
Test: ran cast and ota tests
Change-Id: I6eed117e504ae3287f2ba16c3c507cfdc7456f8d

libwvdrmengine/cdm/test/integration-test.mk

@@ -20,6 +20,7 @@ LOCAL_SRC_FILES := \
     ../core/test/http_socket.cpp \
     ../core/test/license_holder.cpp \
     ../core/test/license_request.cpp \
+    ../core/test/provisioning_holder.cpp \
     ../core/test/test_base.cpp \
     ../core/test/test_printers.cpp \
     ../core/test/url_request.cpp \