(The tests are split out for easier cherry-picking, should we choose to)

In our kube-dns manifest for 1.6 we often had an empty section,
normalization converted this to `{}` which causes `kubectl apply` to
fail.

We can simply skip empty objects when outputing.

Automated cherry pick of #7916: Fix rendering of the Node Authorizer template

Cherry pick of #8241 into 1.15: Update copyrights for 2020

Automated cherry pick of #7832: cilium: don't try to mount sys/fs/bpf if already mounted

systemd v238 already includes the mount, and the unit file fails.  We
test for the existence of the mount, rather than testing systemd
versions directly.

Automated cherry pick of #8022: Bump cilium version to 1.6.4

Automated cherry pick of #8115 Openstack: Fix cluster floating ips

Automated cherry pick of #7545: Complete support for Flatcar

Signed-off-by: Salvatore Mazzarino <dev@mazzarino.cz>

Signed-off-by: Salvatore Mazzarino <dev@mazzarino.cz>

Signed-off-by: Salvatore Mazzarino <dev@mazzarino.cz>

Signed-off-by: Salvatore Mazzarino <dev@mazzarino.cz>

Cherry pick of #8062 to release-1.15

(cherry picked from commit dfee0547)

(cherry picked from commit f21df7cd)

Cherry pick of #8038 onto release-1.15

Automated cherry pick of #8004 origin release 1.15: fix(openstack): fix additional security groups on instance groups

Previously we mistakenly used the names of the additional security
groups where the API is expecting their ID.

Automated cherry pick of #7979: cloudup: Map sprig indent template function

Map Sprig indent string template function into cloudup template
functions.

Cherry pick of #7860 onto release-1.15

Automated cherry pick of #7947: Update for NA storage

Cherry pick of #7856 onto release-1.15