Don't cache installed applications

If livesync android --watch command is executed and the application is not deployed on device, {N} deploys the app on every change. This happens because the installed applications are cached and actually the new application never appears in installed applications.

Fixes NativeScript/nativescript-cli#977

Author: Fatme Havaluova

mobile/android/android-application-manager.ts

@@ -3,23 +3,20 @@
 import {EOL} from "os";
 
 export class AndroidApplicationManager implements Mobile.IDeviceApplicationManager {
-	private _installedApplications: string[];
 
 	constructor(private adb: Mobile.IAndroidDebugBridge,
 		private $staticConfig: Config.IStaticConfig) { }
 
 	public getInstalledApplications(): IFuture<string[]> {
 		return (() => {
-			if (!this._installedApplications) {
-				let result = this.adb.executeShellCommand(["pm", "list", "packages"]).wait();
-				let regex = /package:(.+)/;
-				this._installedApplications = _.map(result.split(EOL), (packageString: string) => {
-					let match = packageString.match(regex);
-					return match ? match[1] : null;
-				}).filter(parsedPackage => parsedPackage !== null);
-			}
-
-			return this._installedApplications;
+			let result = this.adb.executeShellCommand(["pm", "list", "packages"]).wait();
+			let regex = /package:(.+)/;
+			let installedApplications = _.map(result.split(EOL), (packageString: string) => {
+				let match = packageString.match(regex);
+				return match ? match[1] : null;
+			}).filter(parsedPackage => parsedPackage !== null);
+
+			return installedApplications;
 		}).future<string[]>()();
 	}