Fix test package name and missing env variables

[alex-iotiq]

Fixes:

• missing env variables in gradle install tasks
• wrong package name

ADB executes wrong test because of wrong package name. If test has this project package com.my.package.app.test, then the command will be am instrument -w com.my.package.app.test.test.

Tests in the android-example-project have the package name com.example.android_example but ADB instrument command expects the name to be com.example.android_example.test.

[DaGeRe]

Thanks for the PR, looks fine!