I've merged in Sahana's RSA-PSS code, which requires strongswan 5.6.3.
This means that if you don't upgrade the guests to this, the strongswan
tests will fail in swan-prep since it refuses to run the test (to avoid
people pingponging output when they have different strongswan versions)
For fedora-22 I've made the rpm available at:
For f28, it should come with that version automatically.
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