travis: disable failing coverity cert request
travis: disable failing coverity cert request

Paste:
$ echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-
sudo: must be setuid root
depth=3 C = US, O = "Entrust, Inc.", OU = www.entrust.net/CPS is incorporated by reference, OU = "(c) 2006 Entrust, Inc.", CN = Entrust Root Certification Authority
verify error:num=19:self signed certificate in certificate chain
verify return:0
DONE

The command "echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-" failed and exited with 1 during .

favioflamingo/picocoin,favioflamingo/picocoin