Stop warning about non-config files in ddev start, fixes #731

[rfay]

The Problem/Issue/Bug:

Previously we were warning about non-config files (anything in a directory) when warning about mysql and php config.

Also there was no warning about apache config overrides.

How this PR Solves The Problem:

• Use a glob to only warn about files which are actually config overrides.
• Add output for apache overrides.

Manual Testing Instructions:

• Create config overrides (nginx, apache, mysql, php)
• Put things in those directories which are not config overrides.
• Verify that only legitimately named override files are reported.
• nginx config should only be reported for webserver_type=nginx-fpm, converse for apache config.

Automated Testing Overview:

No new tests

Related Issue Link(s):

OP #731

[andrewfrench]

With ddev version (and on Windows):

web   	drud/ddev-webserver:20181002_sqlite             
db    	drud/ddev-dbserver:20180929_mariadb_stderr      
dba   	drud/phpmyadmin:v1.2.0                          
router	drud/ddev-router:20180922_upgrade_debian_stretch
commit	v1.2.0-29-gbf4b294a                             
domain	ddev.local                                      
cli   	v1.2.0-29-gbf4b294a                             

• Create .ddev/mysql/mysql.cnf
• Create .ddev/apache/apache-site.conf
• Create .ddev/php/php.ini
• Create .ddev/nginx-site.conf
• ddev start
• By default (using nginx), the nginx, php, and mysql warnings are written to the terminal
• Change server type to apache-cgi
• ddev start
• Using apache, the apache, php, and mysql warnings are written to the terminal