set jobs for installing openvswitch

On Gentoo this allows multiple packages to compile/install at once.

Change-Id: I23fd629a351b4c6b2acc325611ed47cc04bca404
Signed-off-by: Matthew Thode <mthode@mthode.org>

roles/multi-node-bridge/tasks/common.yaml

@@ -41,6 +41,17 @@
   package:
     name: "{{ ovs_package }}"
     state: present
+  when:
+    - ansible_distribution != 'Gentoo'
+
+- name: Install openvswitch (Gentoo)
+  become: yes
+  package:
+    name: "{{ ovs_package }}"
+    state: present
+    jobs: 8
+  when:
+    - ansible_distribution == 'Gentoo'
 
 - name: Ensure openvswitch is started
   become: yes