Make the expected blessings a slice rather than a string

This is from a comment in a previous CL, that allowing the
app to specify a set of acceptable blessings will make the
system more flexible.

MultiPart: 4/4
Change-Id: Iab39512f322edabfeb163dde441b7970d1de7048
1 file changed
tree: 06cb795040b3646db91e37a0374d014a158f0fe7
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