Initial support for CentOS 7 host

Signed-off-by: Paul Belanger <pabelanger@redhat.com>

tasks/install.yaml

@@ -12,6 +12,9 @@
 - include: install/debian.yaml
   when: ansible_os_family == 'Debian'
 
+- include: install/redhat.yaml
+  when: ansible_os_family == 'RedHat'
+
 - include: install/git.yaml
   when: nodepool_install_method == 'git'
 

tasks/install/redhat.yaml

@@ -0,0 +1,9 @@
+---
+- name: Ensure build dependencies are installed.
+  yum: "pkg={{ item }} state=installed"
+  with_items: nodepool_build_depends
+  when: nodepool_install_method == 'git' or nodepool_install_method == 'pip'
+
+- name: Ensure dependencies are installed.
+  yum: "pkg={{ item }} state=installed"
+  with_items: nodepool_depends

vars/RedHat.yaml

@@ -0,0 +1,15 @@
+---
+__nodepool_build_depends:
+  - gcc
+  - gcc-c++
+  - libffi-devel
+  - libxml2-devel
+  - libxslt-devel
+  - openssl-devel
+  - python-devel
+  - python-pip
+  - zlib-devel
+
+__nodepool_depends:
+  - debootstrap
+  - qemu-img