copr: enable nosync plugin to speed up the building

roles/copr/backend/files/provision/builderpb_nova.yml

@@ -45,3 +45,6 @@
 
   - name: disable offloading
     command: ethtool -K eth0 tso off gro off gso off
+
+  - name: install i686 version of nosync for multilib building
+    dnf: name=https://kojipkgs.fedoraproject.org//packages/nosync/1.0/3.fc23/i686/nosync-1.0-3.fc23.i686.rpm state=present

roles/copr/backend/files/provision/files/mock/site-defaults.cfg

@@ -27,3 +27,5 @@ config_opts['cleanup_on_failure'] = 0
 {% if ansible_distribution == 'Fedora' and ansible_distribution_major_version|int > 21 %}
 config_opts['yum_command'] = '/usr/bin/yum-deprecated'
 {% endif %}
+
+config_opts['nosync'] = True

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -23,6 +23,7 @@
     - scl-utils-build
     - ethtool
 #    - fedpkg-copr
+    - nosync
 
 - name: set bigger timeout for dnf
   ini_file: dest=/etc/dnf/dnf.conf section=main option=timeout value=1000