cygport upload: patch for openssh 6.8p1

[Andrew Schulman <schulman.andrew@epa.gov>]

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Since the latest update to openssh, ssh-keygen's output format for key
fingerprints has changed.  The default hash algorithm is now base64-encoded
SHA256 instead of MD5, and the hash name precedes its value, like

    SHA256:lvRrjAXmEhzDp5kQqzelsei8s5hXJ+zLaqJ2yiGXmYc

This breaks the current logic for detecting key fingerprints in cygport's
lib/pkg_upload.cygpart.  The attached patch fixes the problem.  (You might know
a more precise regex for the base64-encoded hash value than I do.  I couldn't
find any documentation of it anywhere, and just settled for

    SHA256:.{44}

)

Andrew

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--- lib/pkg_upload.cygpart	2015-03-23 02:05:43.493625000 -0400
+++ lib/pkg_upload.cygpart	2015-05-24 12:15:31.969700900 -0400
@@ -74,7 +74,7 @@
 		if ssh-add -l >/dev/null 2>/dev/null
 		then
 			# ssh-agent is already running. Get key fingerprint:
-			key_fingerprint=$(ssh-keygen -l -f "$SSH_KEY" | egrep -o '[0-9a-f]{2}(:[0-9a-f]{2}){15}') \
+			key_fingerprint=$(ssh-keygen -l -f "$SSH_KEY" | egrep -o '(MD5:[0-9a-f]{2}(:[0-9a-f]{2}){15}|SHA256:.{44})') \
 			|| error "Can't read key fingerprint of ${SSH_KEY}. Not a private key file, or corresponding public key file is missing?"
 
 			# Load key into ssh-agent, if it's not already loaded (prompts for passphrase):