e2e-tests: Replace hardcoded scheme with property

Replace the previously hardcoded scheme for http requests with the new
http_scheme property. The core framework documentation [1] now includes
how it can be used to (e.g.) switch test scenarios from http to https.

[1] https://gerrit-review.googlesource.com/c/gerrit/+/275453/1/Documentation/dev-e2e-tests.txt

Change-Id: I02a0f6459fa9f8b311f9035b2673732382c33ffa
diff --git a/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CheckProjectStatisticsUpToGc.json b/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CheckProjectStatisticsUpToGc.json
index e9df002..349c5b1 100644
--- a/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CheckProjectStatisticsUpToGc.json
+++ b/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CheckProjectStatisticsUpToGc.json
@@ -1,5 +1,5 @@
 [
   {
-    "url": "http://HOSTNAME:HTTP_PORT/a/projects/PROJECT/statistics.git"
+    "url": "HTTP_SCHEME://HOSTNAME:HTTP_PORT/a/projects/PROJECT/statistics.git"
   }
 ]
diff --git a/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.json b/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.json
index b4ee549..70e79ca 100644
--- a/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.json
+++ b/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.json
@@ -1,6 +1,6 @@
 [
   {
-    "url": "http://HOSTNAME:HTTP_PORT/a/changes/",
+    "url": "HTTP_SCHEME://HOSTNAME:HTTP_PORT/a/changes/",
     "project": "PROJECT"
   }
 ]
diff --git a/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/DeleteChangesAfterGc.json b/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/DeleteChangesAfterGc.json
index a371757..301c65b 100644
--- a/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/DeleteChangesAfterGc.json
+++ b/src/test/resources/com/ericsson/gerrit/plugins/gcconductor/scenarios/DeleteChangesAfterGc.json
@@ -1,5 +1,5 @@
 [
   {
-    "url": "http://HOSTNAME:HTTP_PORT/a/changes/"
+    "url": "HTTP_SCHEME://HOSTNAME:HTTP_PORT/a/changes/"
   }
 ]