Check if Apache is up and SuEXEC installed on Ysul

Summary:
Minimal tests for T824:

• Is Apache up?
• Does SuEXEC binary exist?

Runs currently only on Ysul.

Test Plan: Run it on Ysul, Apache up and down.

Reviewers: amj

Maniphest Tasks: T824

Differential Revision: http://devcentral.nasqueron.org/D371