Bug 1186286 - Consult more than just the CN when deleting a cert so it's always clear what's being deleted. r=mgoodwin

Deleting certs via the cert manager results in a confirmation dialog popping up.
This dialog contains a list of certs that were selected for deletion.

Currently, only the Common Name of each cert is used to represent it in the list.
This is a problem for certs that don't have a CN. More jarringly, the cert
manager itself falls back to various other attributes, so for example selecting
a cert that is represented by its OU ends up popping up a dialog where an empty
list is shown.

MozReview-Commit-ID: 3z4BebW8Ucd

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extra : rebase_source : 468eb3de470e3ec42471c80183a9c48ebfb130c9
extra : histedit_source : 90e1d2fc73aaba4ded68d933b6ea3a6092d60636