travis: Coverity fixed their SSL cert

_   _                            _ _           _   _
( ) ( )  ___  ___  ___ _   _ _ __(_) |_ _   _  ( ) ( )
 \|  \| / __|/ _ \/ __| | | | '__| | __| | | | |/  |/
        \__ \  __/ (__| |_| | |  | | |_| |_| |
        |___/\___|\___|\__,_|_|  |_|\__|\__, |
                                        |___/

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

.travis.yml

@@ -41,9 +41,6 @@ services: docker
 
 dist: trusty
 
-before_install:
-    - echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
-
 script:
     - if [ ${COVERITY_SCAN_BRANCH} != 1 ]; then
        docker build --pull -t ${RUN_ON_CONTAINER} -f opal-ci/Dockerfile-${RUN_ON_CONTAINER} . &&