Added dpkg option for no prompt

coriolis/osmorphing/debian.py

@@ -146,7 +146,9 @@ class BaseDebianMorphingTools(base.BaseLinuxOSMorphingTools):
         try:
             apt_get_cmd = (
                 '/bin/bash -c "DEBIAN_FRONTEND=noninteractive '
-                'apt-get install %s -y"' % " ".join(package_names))
+                'apt-get install %s -y '
+                '-o Dpkg::Option::=\'--force-confdef\'"' % (
+                    " ".join(package_names)))
             self._exec_cmd_chroot(apt_get_cmd)
         except Exception as err:
             raise exception.FailedPackageInstallationException(