fix(cordova): Adjust app paths for cordova-ios 7

[jcesarmobile]

cordova-ios 7 changed the .ipa/.app paths https://github.com/apache/cordova-ios/pull/1310

This PR adjust the path if executed in cordova-ios >= 7.

Created a new getPackagePathCordova function to not edit the existing getPackagePath, since it's exported maybe somebody is using it and could be breaking to change it. Only call the new method if the getPackageJson doesn't return an undefined pkg.

closes https://github.com/ionic-team/ionic-cli/issues/5048

[pinguluk]

wow, it's still not merged? I still have this problem and I had to rely on symlinks

@ltm @liamdebeasi @jcesarmobile

[pinguluk]

When will this change will be merged?