Fix DocumentRoot in httpd.conf + regression test #295

Job	Run time
Build client image	1m 10s
Build server image	1m 17s
Build httpd+cgi image	25s
Run test scripts (cert_handling.sh)	2m 25s
Run test scripts (cfengine.sh)	2m 5s
Run test scripts (change_ca.sh)	1m 56s
Run test scripts (client_timing.sh)	1m 47s
Run test scripts (clones.sh)	1m 49s
Run test scripts (powershell.sh)	2m 10s
Run test scripts (homepage.sh)	1m 43s
Tag and release	0s
Publish httpd+cgi image	0s
Publish server image	0s
	16m 47s

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