refactor: change info logs to debug or warning

This CL converts some info-level messages to the debug level because
they're irrelevant and shouldn't be shown by default in the Javascript
console.

Also, one info-level message has been converted to a warning because it
represents a situation that couldn't be handled by the extension which
causes the feature to behave in an unexpected manner.

Change-Id: If1a153320c502bd5a2805597c8558456039a89a1
diff --git a/src/xhrInterceptor/responseModifiers/index.js b/src/xhrInterceptor/responseModifiers/index.js
index 0b349bd..057960f 100644
--- a/src/xhrInterceptor/responseModifiers/index.js
+++ b/src/xhrInterceptor/responseModifiers/index.js
@@ -45,7 +45,7 @@
 
     // #!if !production
     if (Object.keys(featuresAreEnabled).length > 0) {
-      console.info(
+      console.debug(
           '[XHR Interceptor - Response Modifier] Requested features',
           featuresAreEnabled, 'for request', request.$TWPTRequestURL);
     }