Ensure SSL CA certificates are installed for curl

On openSUSE, ensure that the ca-certificates-mozilla package is
installed to avoid curl aborting with

  curl: (60) SSL certificate problem: unable to get local issuer certificate

when trying to download the pip source tarball.

Change-Id: Iaf74204ea5330e9abf56f6c9d5a0f9d83992aa59
diff --git a/files/rpms-suse/general b/files/rpms-suse/general
index 355af88..c8c234e 100644
--- a/files/rpms-suse/general
+++ b/files/rpms-suse/general
@@ -1,4 +1,5 @@
 bridge-utils
+ca-certificates-mozilla
 curl
 euca2ools
 git-core