Fix#9538 Inventory iocage fails when DHCP is enabled (#9539)
* Fix#9538 Inventory iocage fails when DHCP is enbled.
* Add changelog fragment 9539-iocage-inventory-dhcp.yml
* Keep iocage_ip4 a string.
* Rename the variable iocage_ip4 to iocage_ip4_dict in _parse_ip4.
* Update the changelog fragment.
* Rename _parse_ip4 parameter ip4_addr to ip4.
* Fix changelog frangment present tense.
* If IP is not available set iocage_ip4='-' instead of the empty string.
* Update changelogs/fragments/9539-iocage-inventory-dhcp.yml
Co-authored-by: Felix Fontein <felix@fontein.de>
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Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 94d5256adb)
Co-authored-by: Vladimir Botka <vbotka@gmail.com>
