8031394: (sl) Fix exception handling in ServiceLoader

Reviewed-by: ahgross, mchung, weijun

src/share/classes/java/util/ServiceLoader.java

@@ -382,7 +382,7 @@ public final class ServiceLoader<S>
                 return p;
             } catch (Throwable x) {
                 fail(service,
-                     "Provider " + cn + " could not be instantiated: " + x,
+                     "Provider " + cn + " could not be instantiated",
                      x);
             }
             throw new Error();          // This cannot happen

src/share/classes/sun/misc/Service.java

@@ -299,7 +299,7 @@ public final class Service<S> {
                 return service.cast(c.newInstance());
             } catch (Throwable x) {
                 fail(service,
-                     "Provider " + cn + " could not be instantiated: " + x,
+                     "Provider " + cn + " could not be instantiated",
                      x);
             }
             return null;        /* This cannot happen */