task-core-tools-debug: Added openssh-sftp-server.

[YOCTO #2605].
Added openssh-sftp-server to the tools-debug IMAGE_FEATURE.

(From OE-Core rev: a6b6df1350149c116050cb93c3c7b4802c709d31)

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/tasks/task-core-tools-debug.bb

@@ -13,6 +13,8 @@ PACKAGES = "\
     ${PN}-dev \
     "
 
+PR = "r1"
+
 PACKAGE_ARCH = "${MACHINE_ARCH}"
 
 ALLOW_EMPTY = "1"
@@ -24,6 +26,7 @@ RDEPENDS_${PN} = "\
     gdb \
     gdbserver \
     tcf-agent \
+    openssh-sftp-server \
     rsync \
     strace \
     ${MTRACE} \