Fix the license for mockito

Mockito is not licensed under Apache 2, but the MIT license [1].

[1] https://github.com/mockito/mockito/blob/release/2.x/LICENSE

Change-Id: I5ed23299c7ef1d67860b84ccfd60751bc2ab15bd

lib/LICENSE-mockito

@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2007 Mockito contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

lib/mockito/BUILD

@@ -7,7 +7,7 @@ package(
 
 java_library(
     name = "mockito",
-    data = ["//lib:LICENSE-Apache2.0"],
+    data = ["//lib:LICENSE-mockito"],
     # Only exposed for plugin tests; core tests should use Easymock
     visibility = ["//java/com/google/gerrit/acceptance:__pkg__"],
     exports = ["@mockito//jar"],