Fix provisioning unittest SConscript path

Fix provisioning unittest SConscript path

When built with TEST option enabled, the wrong path in provisioning SConscript caused an error.
The path in the SConscript has been corrected to reflect its location.

Change-Id: Iedecd4867255ea68e936c2bc20d9e97ae41ce909
Signed-off-by: Jongmin Choi <jminl.choi@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/4753
Reviewed-by: Jongsung Lee <js126.lee@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Dmitriy Zhuravlev <d.zhuravlev@samsung.com>