Move test to the location where gradle expects to find them

Before moving the tests it seemed as if running ./gradlew test didn't
actually execute any unit tests. And without moving the DatabaseTest
to androidTest I couldn't get Android studio to actuallly execute the
test. Now it works both in Android studio and also from the command
line (./gradlew connectedCheck).

Also set testApplicationId to the normal app id + .test suffix.

android_app/app/build.gradle

@@ -5,6 +5,7 @@ android {
 
     defaultConfig {
         applicationId "com.health.openscale"
+        testApplicationId "com.health.openscale.test"
         minSdkVersion 18
         targetSdkVersion 22 // don't set target sdk > 22 otherwise bluetooth le discovery need permission to ACCESS_COARSE_LOCATION
         versionCode 22

android_app/app/src/androidTest/java/com.health.openscale/DatabaseTest.java

@@ -13,7 +13,7 @@
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
-package com.health.openscale.junit;
+package com.health.openscale;
 
 import android.arch.persistence.room.Room;
 import android.content.Context;

android_app/app/src/test/java/com.health.openscale/CsvHelperTest.java

@@ -14,7 +14,7 @@
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
 
-package com.health.openscale.junit;
+package com.health.openscale;
 
 import com.health.openscale.core.datatypes.ScaleMeasurement;
 import com.health.openscale.core.utils.CsvHelper;

android_app/app/src/test/java/com.health.openscale/DateTimeHelpersTest.java

@@ -14,7 +14,7 @@
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
 
-package com.health.openscale.junit;
+package com.health.openscale;
 
 import com.health.openscale.core.utils.DateTimeHelpers;