Disable SSL verification for horizon

Horizon tempest plugin doesn't allow to pass CA bundle to verify
certificate. Until it is resolved we have to force disable SSL cert
verification for horizon

Related-Prod: PROD-19767
Related-Prod: PROD-28621

Change-Id: Ibd6d46eb527f93824caef55f7e181e9a44662414
(cherry picked from commit 9e8cd6a4c8298d1f2b74316f06cfdda1b3731930)
1 file changed