Switch Default for Restart-Command to systemctl

Almost all Linux-Distributions now default to Systemd.  So switch the
Default for Restart-Command to systemctl.

- use /usr/bin/systemctl instead of /bin/systemctl, because with
  usr-Merge the former Dir is dead
- keep Alpine on init.d

Author: cocker-cc

data/common.yaml

@@ -3,5 +3,5 @@ postfix::params::aliasesseltype: ~
 postfix::params::seltype: ~
 postfix::params::mailx_package: 'mailx'
 postfix::params::master_os_template: "postfix/master.cf.default.erb"
-postfix::params::restart_cmd: '/etc/init.d/postfix reload'
+postfix::params::restart_cmd: '/usr/bin/systemctl reload postfix'
 ...

data/os/Alpine.yaml

@@ -1,2 +1,3 @@
 ---
 postfix::params::master_os_template: "postfix/master.cf.debian.erb"
+postfix::params::restart_cmd: '/etc/init.d/postfix reload'

data/osfamily/RedHat.yaml

@@ -1,7 +1,6 @@
 ---
 postfix::params::aliasesseltype: 'etc_aliases_t'
 postfix::params::seltype: 'postfix_etc_t'
-postfix::params::restart_cmd: '/bin/systemctl reload postfix'
 postfix::params::master_os_template: 'postfix/master.cf.redhat.erb'
 postfix::mta_bin_path: '/usr/sbin/sendmail.postfix'
 ...