Fix checker-framework build issues

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=195689456

checker-framework-lint.xml

@@ -0,0 +1,19 @@
+<!-- Copyright (C) 2018 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<lint>
+  <issue id="InvalidPackage">
+    <ignore path="**/checker-qual-*.jar"/>
+  </issue>
+</lint>

library/core/build.gradle

@@ -42,6 +42,10 @@ android {
         //    testCoverageEnabled = true
         // }
     }
+
+    lintOptions {
+        lintConfig file("../../checker-framework-lint.xml")
+    }
 }
 
 dependencies {

library/core/proguard-rules.txt

@@ -29,3 +29,6 @@
 -keepclassmembers class com.google.android.exoplayer2.ext.rtmp.RtmpDataSource {
   <init>();
 }
+
+# Don't warn about checkerframework
+-dontwarn org.checkerframework.**

library/dash/build.gradle

@@ -30,6 +30,10 @@ android {
         //    testCoverageEnabled = true
         // }
     }
+
+    lintOptions {
+        lintConfig file("../../checker-framework-lint.xml")
+    }
 }
 
 dependencies {

library/hls/build.gradle

@@ -30,6 +30,10 @@ android {
         //    testCoverageEnabled = true
         // }
     }
+
+    lintOptions {
+        lintConfig file("../../checker-framework-lint.xml")
+    }
 }
 
 dependencies {

library/smoothstreaming/build.gradle

@@ -30,6 +30,10 @@ android {
         //    testCoverageEnabled = true
         // }
     }
+
+    lintOptions {
+        lintConfig file("../../checker-framework-lint.xml")
+    }
 }
 
 dependencies {