Change behavior of apt.py around installing recommended packages.

Closes #1189.

This will cause the settings in Ansible to override the system settings.
That will have no effect except on systems that have an out-of-Ansible
configuration that disables automatic installation of recommended
packages.  Previously, ansible would use the OS default whenever
install_recommends wasn't part of the playbook.  This change will cause
the Ansible default configuration setting of installing recommended
packages to override the configuration files set on the OS for things
installed through ansible, even when there is no install_recommends
specified in the playbook.  Because the OS default matches the Ansible
default, this shouldn't have wide impact.

packaging/os/apt.py

@@ -231,7 +231,7 @@ def package_status(m, pkgname, version, cache, state):
                 provided_packages = cache.get_providing_packages(pkgname)
                 if provided_packages:
                     is_installed = False
-                    # when virtual package providing only one package, look up status of target package 
+                    # when virtual package providing only one package, look up status of target package
                     if cache.is_virtual_package(pkgname) and len(provided_packages) == 1:
                         package = provided_packages[0]
                         installed, upgradable, has_files = package_status(m, package.name, version, cache, state='install')
@@ -386,7 +386,9 @@ def install(m, pkgspec, cache, upgrade=False, default_release=None,
         if default_release:
             cmd += " -t '%s'" % (default_release,)
         if not install_recommends:
-            cmd += " --no-install-recommends"
+            cmd += " -o APT::Install-Recommends=no"
+        else:
+            cmd += " -o APT::Install-Recommends=yes"
 
         rc, out, err = m.run_command(cmd)
         if rc: