obmc-phosphor-sysd: using shell script as a dummy implementation

For evb-ast2500/evb-ast2600 machine, Python are introduced by
obmc-phosphor-sysd.py. Changing the implementation to shell script
can remove python completely from image.

Test with evb-ast2600:
```
root@evb-ast2500:~# systemctl status obmc-phosphor-sysd
* obmc-phosphor-sysd.service - Phosphor System Manager
     Loaded: loaded (8;;file://evb-ast2500/lib/systemd/system/obmc-phosphor-sysd.service/lib/systemd/system/obmc)
     Active: active (running) since Thu 1970-01-01 00:00:38 UTC; 51 years 9 months ago
   Main PID: 168 (obmc-phosphor-s)
     CGroup: /system.slice/obmc-phosphor-sysd.service
             |-168 /bin/sh /usr/bin/obmc-phosphor-sysd
             `-312 sleep 60

Jan 01 00:00:38 evb-ast2500 systemd[1]: Started Phosphor System Manager.
Jan 01 00:00:40 evb-ast2500 obmc-phosphor-sysd[168]: obmc-phosphor-sysd starting...
```

Signed-off-by: Troy Lee <troy_lee@aspeedtech.com>
Change-Id: I266bd73773483d5ceb2ba01a09d372942eddc939
diff --git a/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd.bb b/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd.bb
index 41a4c1e..06eb55e 100644
--- a/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd.bb
+++ b/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd.bb
@@ -4,10 +4,15 @@
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
 
-inherit obmc-phosphor-pydbus-service
+inherit obmc-phosphor-dbus-service
 
 PROVIDES += "virtual/obmc-system-mgmt"
 RPROVIDES:${PN} += "virtual-obmc-system-mgmt"
 
 S = "${WORKDIR}"
-SRC_URI += "file://${PN}.py"
+SRC_URI += "file://${BPN}.sh"
+
+do_install() {
+    install -d ${D}${bindir}
+    install -m 0755 ${WORKDIR}/${BPN}.sh ${D}${bindir}/${BPN}
+}
diff --git a/meta-phosphor/recipes-phosphor/system/files/obmc-phosphor-sysd.service b/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd/obmc-phosphor-sysd.service
similarity index 100%
rename from meta-phosphor/recipes-phosphor/system/files/obmc-phosphor-sysd.service
rename to meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd/obmc-phosphor-sysd.service
diff --git a/meta-phosphor/recipes-phosphor/system/files/obmc-phosphor-sysd.py b/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd/obmc-phosphor-sysd.sh
similarity index 75%
rename from meta-phosphor/recipes-phosphor/system/files/obmc-phosphor-sysd.py
rename to meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd/obmc-phosphor-sysd.sh
index c8080ac..95488d0 100644
--- a/meta-phosphor/recipes-phosphor/system/files/obmc-phosphor-sysd.py
+++ b/meta-phosphor/recipes-phosphor/system/obmc-phosphor-sysd/obmc-phosphor-sysd.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/bin/sh
 
 # Contributors Listed Below - COPYRIGHT 2015
 # [+] International Business Machines Corp.
@@ -16,14 +16,9 @@
 # implied. See the License for the specific language governing
 # permissions and limitations under the License.
 
-import time
-import sys
-import dbus
-import dbus.service
-import dbus.mainloop.glib
+echo "obmc-phosphor-sysd starting..."
 
-if __name__ == '__main__':
-	print "obmc-phosphor-watchdogd starting..."
-
-	while 1:
-		time.sleep(5)
+while true
+do
+	sleep 60
+done