Reduce verbosity of several logging statements from INFO to FINE. (#2260)

These statements become extremely verbose in busy clusters, as they appear to be
printed once for each test crossed with each node when the cluster is full. So
for my cluster which runs more than 50 nodes and regularly sees >200 tests
submitted at once, these can print tens of thousands of log lines per second,
adding up to gigabytes of logging per day.

Author: ekuefler

java/server/src/org/openqa/grid/internal/BaseRemoteProxy.java

@@ -330,15 +330,15 @@ public URL getRemoteHost() {
   }
 
   public TestSession getNewSession(Map<String, Object> requestedCapability) {
-    log.info("Trying to create a new session on node " + this);
+    log.fine("Trying to create a new session on node " + this);
 
     if (!hasCapability(requestedCapability)) {
-      log.info("Node " + this + " has no matching capability");
+      log.fine("Node " + this + " has no matching capability");
       return null;
     }
     // any slot left at all?
     if (getTotalUsed() >= config.maxSession) {
-      log.info("Node " + this + " has no free slots");
+      log.fine("Node " + this + " has no free slots");
       return null;
     }
     // any slot left for the given app ?

java/server/src/org/openqa/grid/internal/ProxySet.java

@@ -148,7 +148,7 @@ public TestSession getNewSession(Map<String, Object> desiredCapabilities) {
     // test running, to avoid putting all the load of the first
     // proxies.
     List<RemoteProxy> sorted = getSorted();
-    log.info("Available nodes: " + sorted);
+    log.fine("Available nodes: " + sorted);
 
     for (RemoteProxy proxy : sorted) {
       TestSession session = proxy.getNewSession(desiredCapabilities);