Update vars files with better organization and usage separation

vars/packages.yml

@@ -0,0 +1,52 @@
+---
+omni_packages_global:
+  - automake
+  - cmake
+  - curl
+  - gcc
+  - gcc-c++
+  - git
+  - make
+  - nano
+  - openssl-devel
+  - openssh-server
+  - systemd-devel
+  - unzip
+  - vim
+  - vim-minimal
+
+omni_packages_fedora:
+  - libselinux-python
+  - git-lfs
+  - readline-devel
+  - policycoreutils-python
+  - python-devel
+  - python-virtualenv
+  - python3-devel
+  - systemd-networkd
+  - systemd-resolved
+
+omni_packages_centos_8:
+  - bind-utils
+  - bash-completion
+  - nc
+  - nfs-utils
+  - python3
+  - python3-pip
+  - python3-setuptools
+  - python3-virtualenv
+  - systemd-networkd
+  - wget
+
+omni_packages_centos_7:
+  - bind-utils
+  - bash-completion
+  - nc
+  - nfs-utils
+  - python3
+  - python3-pip
+  - python3-setuptools
+  - python3-virtualenv
+  - systemd-networkd
+  - systemd-resolved
+  - wget