Add dnsjava as submodule

.gitmodules

@@ -25,3 +25,6 @@
 [submodule "extern/openkeychain-api-lib"]
 	path = extern/openkeychain-api-lib
 	url = https://github.com/open-keychain/openkeychain-api-lib.git
+[submodule "extern/dnsjava"]
+	path = extern/dnsjava
+	url = https://github.com/open-keychain/dnsjava.git

OpenKeychain/build.gradle

@@ -14,7 +14,6 @@ dependencies {
 
     compile 'com.android.support:support-v4:19.1.0'
     compile 'com.android.support:appcompat-v7:19.1.0'
-    compile 'dnsjava:dnsjava:2.1.1'
     compile project(':extern:openpgp-api-lib')
     compile project(':extern:openkeychain-api-lib')
     compile project(':extern:html-textview')
@@ -27,6 +26,7 @@ dependencies {
     compile project(':extern:spongycastle:pkix')
     compile project(':extern:spongycastle:prov')
     compile project(':extern:AppMsg:library')
+    compile project(':extern:dnsjava')
 
     // Dependencies for the `instrumentTest` task, make sure to list all your global dependencies here as well
     androidTestCompile 'junit:junit:4.10'

settings.gradle

@@ -11,3 +11,4 @@ include ':extern:spongycastle:pg'
 include ':extern:spongycastle:pkix'
 include ':extern:spongycastle:prov'
 include ':extern:AppMsg:library'
+include ':extern:dnsjava'