Do not reset URI path for Checks API

Fixes issue JENKINS-63887.

Author: Alexander Ost

src/main/java/com/google/gerrit/plugins/checks/client/Checkers.java

@@ -103,7 +103,9 @@ private URI buildRequestUrl() throws URISyntaxException {
 
   private URI buildRequestUrl(String suffixPath) throws URISyntaxException {
     return uriBuilder
-        .setPath(String.format("%splugins/checks/checkers/%s", getPrefix(), suffixPath))
+        .setPath(
+            String.format(
+                "%splugins/checks/checkers/%s", uriBuilder.getPath() + getPrefix(), suffixPath))
         .build();
   }
 }

src/main/java/com/google/gerrit/plugins/checks/client/Checks.java

@@ -161,7 +161,7 @@ private URI buildRequestUrl(String suffixPath) throws URISyntaxException {
         .setPath(
             String.format(
                 "%schanges/%d/revisions/%d/checks/%s",
-                getPrefix(), changeNumber, patchSetNumber, suffixPath))
+                uriBuilder.getPath() + getPrefix(), changeNumber, patchSetNumber, suffixPath))
         .build();
   }
 }

src/main/java/com/google/gerrit/plugins/checks/client/PendingChecks.java

@@ -82,6 +82,6 @@ private URI buildRequestUrl() throws URISyntaxException {
       }
       uriBuilder.setParameter("query", queryString.toString());
     }
-    return uriBuilder.setPath(getPrefix() + PENDING_CHECKS_PATH).build();
+    return uriBuilder.setPath(uriBuilder.getPath() + getPrefix() + PENDING_CHECKS_PATH).build();
   }
 }