minion.conf: Accept tcp_keepalive* properties

Add TCP keepalive configuration options [1] to the list of accepted
minion config keys.

[1] https://docs.saltstack.com/en/latest/ref/configuration/minion.html

Change-Id: If80083fc793b86147b3691216dea571ea2cf0858
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
1 file changed