fix: flatcar bootstrap (#10363)

roles/bootstrap-os/files/bootstrap.sh

@@ -39,4 +39,8 @@ mv -n "${PYPY_FILENAME}" pypy3
 ln -s ./pypy3/bin/pypy3 python
 $BINDIR/python --version
 
+# install PyYAML
+./python -m ensurepip
+./python -m pip install pyyaml
+
 touch $BINDIR/.bootstrapped

roles/kubernetes/preinstall/tasks/0081-ntp-configurations.yml

@@ -30,7 +30,7 @@
     ntp_service_name: >-
       {% if ntp_package == "chrony" -%}
       chronyd
-      {%- elif ansible_os_family == 'RedHat' -%}
+      {%- elif ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk", "RedHat"] -%}
       ntpd
       {%- else -%}
       ntp