Restore some kube-proxy defaults

[r2d4]

Set some kube-proxy defaults that got unset through the new way of
configuring kube-proxy. Add more delay to the ip tables syncing reduces
idle CPU load a lot.

See
#1158 (comment)

$ ps uaxS | grep localkube

Without these options

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root      3643 89.3 19.7 11469032 404500 ?     Ssl  18:04   0:55 /usr/local/bin/localkube --dns-domain=cluster.local --node-ip=192.168.99.101 --generate-certs=false --logtostderr
=true --enable-dns=false

With

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root      3901 13.4 13.0 11403508 267744 ?     Ssl  17:52   1:00 /usr/local/bin/localkube --dns-domain=cluster.local --node-ip=192.168.99.101 --generate-certs=false --logtostderr
=true --enable-dns=false

[codecov-io]

Codecov Report

Merging #1699 into master will decrease coverage by 0.1%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1699      +/-   ##
==========================================
- Coverage   38.55%   38.45%   -0.11%     
==========================================
  Files          51       51              
  Lines        2674     2681       +7     
==========================================
  Hits         1031     1031              
- Misses       1463     1470       +7     
  Partials      180      180

Impacted Files	Coverage Δ
pkg/localkube/proxy.go	0% <0%> (ø)	⬆️

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