Fix apache2 dependencies

[binary-sequence]

When installing openQA in a docker image, some dependencies of apache2 are not available:

• which
• w3m

[binary-sequence]

• Related poo#28406
• SR already on devel package: OBS#Apache/apache2?rev=535)
• Waiting for fix to be included into factory: OBS#openSUSE:Factory/apache2/revisions