Bug 578024 - Improve TrustCertificateDialog

Add helpContext and shows expiration date.

Change-Id: Ie8b3c737669655e34060496f7b25468fc36fc1d6
Reviewed-on: https://git.eclipse.org/r/c/equinox/rt.equinox.p2/+/189481
Tested-by: Equinox Bot <equinox-bot@eclipse.org>
Reviewed-by: Mickael Istria <mistria@redhat.com>
2 files changed