Add skip for tests test_signed_image_upload_*

Skip tests if barbican_intagration_enabled = False

Related-PROD: PRODX-5292
Change-Id: Ie4fcfc00b0152755e2c82dfd13c6b7e473242871
(cherry picked from commit 09d0f6ff10a83f44b9b999582a94a513ebbb89e8)
(cherry picked from commit bc4e1475c1bc0fd49149aae462afbadc955e895c)
(cherry picked from commit bf331747566c14e0a7b6170e8501500d439b7296)
1 file changed