Add new integration test: Check get project (esp. CSP values)
Add new integration test: Check get project (esp. CSP values)

This commit checks to make sure that the hardening headers added are
at least what we expect.  That way, when we update the secure_headers gem,
we will detect reductions or unexpected changes to our hardening mechanisms.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

yannickmoy/cii-best-practices-badge,coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,coreinfrastructure/best-practices-badge,coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,coreinfrastructure/best-practices-badge,yannickmoy/cii-best-practices-badge