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/vdc.cpp b/vdc.cpp
index a6a3fb0..c0b798d 100644
--- a/vdc.cpp
+++ b/vdc.cpp
@@ -99,6 +99,8 @@
         checkStatus(args, vold->fdeEnable(passwordType, "", encryptionFlags));
     } else if (args[0] == "cryptfs" && args[1] == "mountdefaultencrypted") {
         checkStatus(args, vold->mountDefaultEncrypted());
+    } else if (args[0] == "volume" && args[1] == "abort_fuse") {
+        checkStatus(args, vold->abortFuse());
     } else if (args[0] == "volume" && args[1] == "shutdown") {
         checkStatus(args, vold->shutdown());
     } else if (args[0] == "volume" && args[1] == "reset") {