Import public keys needed for verify

Change-Id: I21e313f9dc6ccbe974443c8feb92e166b703d9dd
Correctly iterate through apt:repo:updates

Change-Id: I37f388dd4dc7faafd6027b12dbad4c07be7478a0
Ignore the reprepro special value 'blindtrust'

Change-Id: Ie8d5a6ad834cd93adc456d67d92f9b7a688da201
We should test for both truth and the special value

Change-Id: Ib24bcfb80fbbcf88aff326c36b23ebbc2c9902a2