[Pidgin] #3009: Check signature chains before checking hostname

[Pidgin]

#3009: Check signature chains before checking hostname
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 Reporter:  wehlhard   |       Owner:  wehlhard
     Type:  defect     |      Status:  new     
 Priority:  minor      |   Milestone:  2.2.1   
Component:  libpurple  |     Version:  2.1.1   
 Keywords:             |     Pending:  0       
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 The tls_cached code should check the certificate signatures BEFORE
 checking the hostname, not after.

 Also, maybe it should prompt the user again if the hostname check fails?

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Ticket URL: <http://developer.pidgin.im/ticket/3009>
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