vold: Support aborting FUSE connections.

This can be done through binder as well as vdc, using 'vdc volume
abort_fuse'.

Bug: 153411204
Test: adb shell vdc volume abort_fuse
Change-Id: I93e46dc1cd361729cc1162c63520cf73152ea409
diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index 1020526..a37ba5a 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -175,6 +175,13 @@
     return translate(VolumeManager::Instance()->shutdown());
 }
 
+binder::Status VoldNativeService::abortFuse() {
+    ENFORCE_SYSTEM_OR_ROOT;
+    ACQUIRE_LOCK;
+
+    return translate(VolumeManager::Instance()->abortFuse());
+}
+
 binder::Status VoldNativeService::onUserAdded(int32_t userId, int32_t userSerial) {
     ENFORCE_SYSTEM_OR_ROOT;
     ACQUIRE_LOCK;