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When requiring unique flags for CHILD_SAs, allow the configuration to request different marks for each direction by using the %unique-dir keyword. This is useful when different marks are desired for each direction but the number of peers is not predefined. An example use case is when implementing a site-to-site route-based VPN without VTI devices. A use of 0.0.0.0/0 - 0.0.0.0/0 traffic selectors with identical in/out marks results in outbound traffic being wrongfully matched against the 'fwd' policy - for which the underlay 'template' does not match - and dropped. Using different marks for each direction avoids this issue as the 'fwd' policy uses the 'in' mark will not match outbound traffic. Closes strongswan/strongswan#78.