support ft_232h, cp210_ multiport devices

harmonize claimInterface() error handling
cancel read() on close()

usbSerialForAndroid/build.gradle

@@ -3,12 +3,12 @@ apply plugin: 'maven'
 apply plugin: 'signing'
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 27
     buildToolsVersion '27.0.3'
 
     defaultConfig {
         minSdkVersion 14
-        targetSdkVersion 26
+        targetSdkVersion 27
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
 
@@ -23,7 +23,7 @@ android {
 dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support:support-annotations:27.1.1'
-    androidTestImplementation 'com.android.support.test:runner:1.0.1'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'commons-net:commons-net:3.6'
     androidTestImplementation 'org.apache.commons:commons-lang3:3.7'
 }