flatcar-postinst: Remove old Azure workaround

The workaround for instances migrated from CoreOS shouldn't be needed
anymore, especially if we are now migrating the OEM partition contents
to the new setup with the OEM systemd-sysext image.
Remove the old Azure workaround.

Author: pothos

flatcar-postinst

@@ -119,19 +119,6 @@ EOF
     systemctl start --no-block locksmithd-kicker.timer
 fi
 
-# Azure's agent erroneously looks at the distribution name instead of its ID.
-# This prevents us from renaming the OS from "Flatcar". This patches platform.py
-# to always return "Flatcar" as the distribution name.
-PLATFORM_PATH="/usr/share/oem/python/lib64/python2.7/platform.py"
-if [ -e ${PLATFORM_PATH} ]; then
-    sum=($(md5sum ${PLATFORM_PATH}))
-    if [ ${sum} == "6315addf42c0b07f5f78d119b578e20a" ]; then
-        sed --in-place \
-            "s%distname = os_release_info\['NAME'\]%distname = \"Flatcar\"%" \
-            ${PLATFORM_PATH}
-    fi
-fi
-
 # Gather metadata about upcoming OS image.
 # shellcheck source=/dev/null
 source "${INSTALL_MNT}/lib/os-release"