Move commons-io from lib/BUILD to lib/commons/BUILD

All the commons-* libraries are defined in lib/commons/BUILD with
the exception of commons-io which is in lib/BUILD.

Move it to lib/commons/BUILD to make it consistent.

Change-Id: If2541eba2a4a9e9b5e7a777940bfce923478808b

lib/BUILD

@@ -300,10 +300,3 @@ java_library(
     visibility = ["//visibility:public"],
     exports = ["@postgresql//jar"],
 )
-
-java_library(
-    name = "commons-io",
-    data = ["//lib:LICENSE-Apache2.0"],
-    visibility = ["//visibility:public"],
-    exports = ["@commons-io//jar"],
-)

lib/commons/BUILD

@@ -21,6 +21,13 @@ java_library(
     exports = ["@commons-compress//jar"],
 )
 
+java_library(
+    name = "io",
+    data = ["//lib:LICENSE-Apache2.0"],
+    visibility = ["//visibility:public"],
+    exports = ["@commons-io//jar"],
+)
+
 java_library(
     name = "lang",
     data = ["//lib:LICENSE-Apache2.0"],