Update to android things sdk 0.8 and API 27

Updated to use Android Things SDK 0.8-devpreview
Updated to the API changes in DP8
Updated to use Android API 27
Removed buildToolsVersion
Add nocompress to *.so files on tensorflow imageclassifier

Bug: 72671975
Bug: 77507209
Change-Id: I2bb3496ec116054eaa3cbb8c3f5b6f4fb51c39ac

Author: mangini

java/app/build.gradle

@@ -16,12 +16,11 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion '26.0.2'
+    compileSdkVersion 27
     defaultConfig {
         applicationId "com.example.androidthings.gattserver"
-        minSdkVersion 26
-        targetSdkVersion 25
+        minSdkVersion 27
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }

kotlin/app/build.gradle

@@ -17,12 +17,11 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 26
-    buildToolsVersion '26.0.2'
+    compileSdkVersion 27
     defaultConfig {
         applicationId "com.example.androidthings.gattserver"
-        minSdkVersion 26
-        targetSdkVersion 25
+        minSdkVersion 27
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }