docs: nginx will not install correctly via APT

[Chris Sharp]

On Ubuntu 16.04, following the instructions in the README, installing nginx before changing Apache's listening ports fails with the following:

Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.
invoke-rc.d: initscript nginx, action "start" failed.

systemctl status nginx.service:

Mar 04 15:13:09 xenial nginx[15773]: nginx: [emerg] listen() to [::]:80, backlog 511 fai
Mar 04 15:13:10 xenial nginx[15773]: nginx: [emerg] listen() to 0.0.0.0:80, backlog 511
Mar 04 15:13:10 xenial nginx[15773]: nginx: [emerg] listen() to [::]:80, backlog 511 fai
Mar 04 15:13:10 xenial nginx[15773]: nginx: [emerg] listen() to 0.0.0.0:80, backlog 511
Mar 04 15:13:10 xenial nginx[15773]: nginx: [emerg] listen() to [::]:80, backlog 511 fai
Mar 04 15:13:11 xenial nginx[15773]: nginx: [emerg] still could not bind()
Mar 04 15:13:11 xenial systemd[1]: nginx.service: Control process exited, code=exited st
Mar 04 15:13:11 xenial systemd[1]: Failed to start A high performance web server and a r
Mar 04 15:13:11 xenial systemd[1]: nginx.service: Unit entered failed state.
Mar 04 15:13:11 xenial systemd[1]: nginx.service: Failed with result 'exit-code'.
 ESCOC

This happens because ports 80 and 443 are already in use by Apache.

Branch on the way.

[Chris Sharp (chrissharp123)]

Branch available here:

http://git.evergreen-ils.org/?p=working/OpenSRF.git;a=shortlog;h=refs/heads/user/csharp/lp1670045_nginx_docs_correction

[Ben Shum (bshum)]

Fix pushed to openSRF master and backported to rel_2_5 for next release. Thanks Chris, works for me!