Cleanup codes for CentOS/RHEL7

... since now this modules supports only CentOS8/RHEL8.

Change-Id: I3769b2b5c8e2e22e73742d392462fd23a6961af9

manifests/params.pp

@@ -27,8 +27,7 @@ class ironic::params {
 
   if ($::os_package_type == 'debian') {
     $syslinux_path_custom = '/usr/lib/syslinux'
-  } elsif ($::os['name'] == 'Fedora') or
+  } elsif ($::os['family'] == 'RedHat'){
-          ($::os['family'] == 'RedHat' and Integer.new($::os['release']['major']) > 7) {
     $syslinux_path_custom = '/tftpboot'
   } else {
     $syslinux_path_custom = '/var/lib/tftpboot'
@@ -66,11 +65,7 @@ class ironic::params {
       $ipxe_package              = 'ipxe-bootimgs'
       $syslinux_package          = 'syslinux-tftpboot'
       $syslinux_path             = $syslinux_path_custom
-      if (Integer.new($::os['release']['major']) > 7) {
       $syslinux_files            = ['pxelinux.0', 'chain.c32', 'ldlinux.c32']
-      } else {
-          $syslinux_files            = ['pxelinux.0', 'chain.c32']
-      }
     }
     'Debian': {
       $common_package_name       = 'ironic-common'

manifests/pxe.pp

@@ -76,8 +76,7 @@ class ironic::pxe (
   $http_root_real = pick($::ironic::pxe::common::http_root, $http_root)
   $http_port_real = pick($::ironic::pxe::common::http_port, $http_port)
 
-  if ($::os['name'] == 'Fedora') or
+  if $::os['family'] == 'RedHat' {
-    ($::os['family'] == 'RedHat' and Integer.new($::os['release']['major']) > 7) {
     $arch = "-${::os['architecture']}"
   } else {
     $arch = ''

releasenotes/notes/drop-el7-support-1e4a347a8c45851b.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Compatibility with el7 (RHEL7.x, CentOS7.x and so on) has been removed.
+