Change redirect directive in apache.vhost.sample file

[mbukatov]

Redirect directive in api/config/apache.vhost.sample contains ssl_virtualhost_ip:

#Redirect permanent / https://%ssl_virtualhost_ip%/

This should be changed to indicate that the expected value is hostname (fqdn).

[mbukatov]

@dahorak @GowthamShanmugam This is the issue with ip address vs hostname we discussed during our ad hoc meeting on 2019-02-21.