Simplify bifrost-ironic-install required_defaults

removing required_defaults_RedHat.yml;
efi_distro seems to only get used for grub_config_path, and 'rhel'
is not the correct path on my UEFI rhel8 system. It's 'redhat', and
according to the only documentation [1] I found on a quick search,
it's probably been this since EL6. Which means we can use
'redhat' all over the board.

The unique values in efi_distro, grub_efi_binary and shim_efi_binary
correspond to ansible_facts['distribution'], which holds true for
centos and fedora aswell, so we can put all these in RedHat_family

removing required_defaults_CentOS.yml;
The common values from required_defaults_RedHat_family.yml should
suffice.

removing required_defaults_Fedora.yml;
Support for fedora has been deprecated [2], but since it's in the
os_family of redhat, we're only missing 'qemu-kvm' and
'policycoreutils-python-utils' from 'required_packages', so
deployment will probably still work.

[1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/installation_guide/s2-grub-whatis-booting-uefi
[2] https://review.opendev.org/c/openstack/bifrost/+/818780

Change-Id: Ieb35391fae5bd24ab420dc4239117e045f8b35ed

playbooks/roles/bifrost-ironic-install/defaults/required_defaults_CentOS.yml

@@ -1,4 +0,0 @@
----
-efi_distro: centos
-grub_efi_binary: /boot/efi/EFI/centos/grubx64.efi
-shim_efi_binary: /boot/efi/EFI/centos/shimx64.efi

playbooks/roles/bifrost-ironic-install/defaults/required_defaults_Fedora.yml

@@ -1,40 +0,0 @@
----
-init_dest_dir: /usr/lib/systemd/system/
-ipxe_dir: /usr/share/ipxe/
-ipxe_full_binary: ipxe.lkrn
-ironic_rootwrap_dir: /usr/bin/
-mysql_service_name: mariadb
-tftp_service_name: tftp
-efi_distro: fedora
-grub_efi_binary: /boot/efi/EFI/fedora/grubx64.efi
-shim_efi_binary: /boot/efi/EFI/fedora/shimx64.efi
-required_packages:
-  - dnsmasq
-  - firewalld
-  - gcc
-  - xorriso
-  - grub2-efi-x64
-  - httpd-tools
-  - ipmitool
-  - ipxe-bootimgs
-  - kpartx
-  - libffi-devel
-  - libxml2-devel
-  - libxslt-devel
-  - mariadb-server
-  - openssl-devel
-  - parted
-  - policycoreutils-python-utils
-  - psmisc
-  - python3-devel
-  - python3-iniparse
-  - python3-libselinux
-  - python3-policycoreutils
-  - python3-PyMySQL
-  - qemu-img
-  - qemu-kvm
-  - shim-x64
-  - socat
-  - syslinux-nonlinux
-  - wget
-  - dosfstools

playbooks/roles/bifrost-ironic-install/defaults/required_defaults_RedHat.yml

@@ -1,4 +0,0 @@
----
-efi_distro: rhel
-grub_efi_binary: /boot/efi/EFI/redhat/grubx64.efi
-shim_efi_binary: /boot/efi/EFI/redhat/shimx64.efi

playbooks/roles/bifrost-ironic-install/defaults/required_defaults_RedHat_family.yml

@@ -6,6 +6,9 @@ ipxe_efi_binary: ipxe-x86_64.efi
 ironic_rootwrap_dir: /usr/bin/
 mysql_service_name: mariadb
 tftp_service_name: tftp
+efi_distro: "{{ ansible_facts['distribution'] | lower }}"
+grub_efi_binary: "/boot/efi/EFI/{{ efi_distro }}/grubx64.efi"
+shim_efi_binary: "/boot/efi/EFI/{{ efi_distro }}/shimx64.efi"
 required_packages:
   - mariadb-server
   - dnsmasq