USN-6105-2: ca-certificates update

USN-6105-2: ca-certificates update

USN-6105-1 updated ca-certificates. This provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

The ca-certificates package contained outdated CA certificates. This update
refreshes the included certificates to those contained in the 2.60 version
of the Mozilla certificate authority bundle.
Source: USN-6105-2: ca-certificates update