fix: adapt to napalm-device-types 4.7

napalm-device-types 4.7 changed three things this driver depends on:

- parse_dnf_security needs the "__DNF_RC=<status>" line that
  DNF_SECURITY_COMMAND prints and raises ValueError without it or when dnf
  failed. The yum security query had no such line, so listing updates on
  any yum host raised. _YUM_SECURITY_COMMAND now prints the marker the same
  way ("{ ...; echo __DNF_RC=$?; } | cat"). _rpm_security_names checks
  __DNF_RC itself and turns a failed query, or output cut short before the
  marker, into None (security unknown) rather than "no advisories" or an
  exception.
- OSDriver.get_users was renamed to get_os_users, since NAPALM's own
  get_users has another shape. LinuxDriver.get_users is now get_os_users
  with the same return value.
- run_on_transport reads an exec channel to EOF after its exit status
  arrives; the tests' fake channels gain recv/recv_stderr for that.

Require napalm-device-types>=4.7.1 and bump the version to 0.6.0.

README.md

@@ -60,7 +60,7 @@ with Driver(
     packages = dev.get_packages()
     updates  = dev.get_pending_updates()
     services = dev.get_services()
-    users    = dev.get_users()
+    users    = dev.get_os_users()
     procs    = dev.get_processes()
     jobs     = dev.get_cron_jobs()
 
@@ -106,7 +106,7 @@ with Driver(
 | `apply_updates(packages)` | ✅ | apt, dnf, yum, apk, pacman |
 | `get_services()` | ✅ | systemd, one round trip (fallback: SysV `service`) |
 | `manage_service(name, action)` | ✅ | systemd: start, stop, restart, enable, disable |
-| `get_users()` | ✅ | `/etc/passwd` + `/etc/group` |
+| `get_os_users()` | ✅ | `/etc/passwd` + `/etc/group` |
 | `get_processes()` | ✅ | `ps axo` |
 | `get_cron_jobs()` | ✅ | user crontabs + `/etc/cron.d/` |