[System][Non-ACR][Fix Tizen.System.Manual.Tests to avoid crash

[System][Non-ACR][Fix Tizen.System.Manual.Tests to avoid crash

warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
Core was generated by `/opt/usr/globalapps/Tizen.System.Manual.Tests/bin/Tizen.System.Manual.Tests.dll'.
Program terminated with signal SIGABRT, Aborted.
[Current thread is 1 (LWP 19445)]
(gdb) bt
    at /usr/src/debug/coreclr-3.0.0/src/pal/src/thread/process.cpp:1480
    at /usr/src/debug/coreclr-3.0.0/src/vm/eepolicy.cpp:511
    pszMessage=0xb8968978 u"A callback was made on a garbage collected delegate of type 'Tizen.System.Storage!Interop+Storage+StorageS
tateChangedCallback::Invoke'.", pExceptionInfo=0xbee96a40, errorSource=0x0, argExceptionString=<optimized out>)
    at /usr/src/debug/coreclr-3.0.0/src/vm/eepolicy.cpp:1213
    at /usr/src/debug/coreclr-3.0.0/src/vm/dllimportcallback.cpp:1021
    fsuuid=0xb8a086a8 "7076-0F0C", mountpath=0xb89f4b60 "/opt/media/SDCardA", primary=true, flags=0, user_data=0x0)
    at /usr/src/debug/libstorage-1.0.0/src/storage.c:367
    at /usr/src/debug/libstorage-1.0.0/src/storage-external.c:248
    at /usr/src/debug/libstorage-1.0.0/src/storage-external-dbus.c:443
    signal=0xad904cf0 "DeviceRemoved", params=0xad907050, user_data=0x0)
    at /usr/src/debug/libstorage-1.0.0/src/storage-external-dbus.c:488

Change-Id: I9ac48e88bb543daffaa0add974fb2dbdafc4d3ea
Signed-off-by: Hyotaek Shim <hyotaek.shim@samsung.com>