Enable BMC patching from the /usr/local path

This commit enables patches from the /usr/local path by replacing
absolute paths to /usr/sbin or /usr/bin in every service file with
"/usr/bin/env ". Additionally, SyslogIdentifier is added to each
file to ensure that journal entries are still distinct.

In two cases, service files also had to change due to references
to ${{PATH}}, which doesn't work with /usr/bin/env. These
references - and the corresponding definitions - were changed to
${{DEVPATH}}.

Resolves openbmc/openbmc#2149

Change-Id: I12c5c6e5101eef6820b985a563313836250ff2c7
Signed-off-by: Michael Tritz <mtritz@us.ibm.com>
diff --git a/common/recipes-phosphor/host/obmc-op-control-host/op-init-pnor@.service b/common/recipes-phosphor/host/obmc-op-control-host/op-init-pnor@.service
index 5accb48..26a0343 100644
--- a/common/recipes-phosphor/host/obmc-op-control-host/op-init-pnor@.service
+++ b/common/recipes-phosphor/host/obmc-op-control-host/op-init-pnor@.service
@@ -9,7 +9,8 @@
 Type=oneshot
 RemainAfterExit=yes
 # TODO openbmc/openbmc#1598 - Delete this service once available
-ExecStart={sbindir}/pflash -i
+ExecStart=/usr/bin/env pflash -i
+SyslogIdentifier=pflash
 
 [Install]
 WantedBy=obmc-host-start@%i.target
diff --git a/common/recipes-phosphor/host/obmc-op-control-host/op-start-host@.service b/common/recipes-phosphor/host/obmc-op-control-host/op-start-host@.service
index c9d1a7c..2617941 100644
--- a/common/recipes-phosphor/host/obmc-op-control-host/op-start-host@.service
+++ b/common/recipes-phosphor/host/obmc-op-control-host/op-start-host@.service
@@ -14,7 +14,8 @@
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStart={sbindir}/mapper call /org/openbmc/control/host%i org.openbmc.control.Host boot
+ExecStart=/usr/bin/env mapper call /org/openbmc/control/host%i org.openbmc.control.Host boot
+SyslogIdentifier=mapper
 
 [Install]
 WantedBy=obmc-host-start@%i.target
diff --git a/common/recipes-phosphor/host/obmc-op-control-host/org.openbmc.control.Host@.service b/common/recipes-phosphor/host/obmc-op-control-host/org.openbmc.control.Host@.service
index 59d0c3d..9a64002 100644
--- a/common/recipes-phosphor/host/obmc-op-control-host/org.openbmc.control.Host@.service
+++ b/common/recipes-phosphor/host/obmc-op-control-host/org.openbmc.control.Host@.service
@@ -5,7 +5,8 @@
 
 [Service]
 Restart=always
-ExecStart={sbindir}/control_host.exe
+ExecStart=/usr/bin/env control_host.exe
+SyslogIdentifier=control_host.exe
 Type=dbus
 BusName={BUSNAME}