debian/pcp.postinst.tail: don't dink with /var/run/pcp here

Addresses https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1071103
where /var/run/pcp may not exist at the time we tried to chown+chmod
it here.

The setup up of /var/run/pcp is more safely done in pcp-reboot-init,
but there was a small change required to
    src/pcp-reboot-init/pcp-reboot-init.service.in
required to make sure this was run before pmcd was started.

debian/pcp.postinst.tail

@@ -29,8 +29,8 @@ chown pcp:pcp /var/lib/pcp/tmp
 chmod 775 /var/lib/pcp/tmp
 chown pcp:pcp /var/log/pcp
 chmod 775 /var/log/pcp
-chown pcp:pcp /var/run/pcp
-chmod 775 /var/run/pcp
+# we used to dink with /var/run/pcp here, but that is done more
+# safely in pcp-reboot-init now
 
 # must match src/pmdas/{json,bash,mmv}/GNUmakefile
 #

src/pcp-reboot-init/pcp-reboot-init.service.in

@@ -3,7 +3,7 @@ Description=PCP Reboot Initialization Helper Service
 Documentation=man:pcp-reboot-init(1)
 DefaultDependencies=no
 After=network-online.target systemd-tmpfiles-setup.service
-Before=pmlogger.service pmie.service pmproxy.service
+Before=pmlogger.service pmie.service pmproxy.service pmcd.service
 
 [Service]
 Type=oneshot