library: Allow specifying the path to strongswan.conf in the STRONGSWAN_CONF env var
stroke: Allow specifying the ipsec.secrets location in strongswan.conf
starter: Allow specifying the ipsec.conf location in strongswan.conf
testing: Reissue attribute certificates for the new holder certificates

Due to the expired and reissued holder certificates of carol and dave, new
attribute certificates are required to match the holder certificates serial in
the ikev2/acert-{cached,fallback,inline} tests.
testing: Add some notes about how to reissue attribute certificates
testing: Update carols certificate in several test cases
testing: Update public keys and certificates in DNS zone
testing: Update public keys in DNSSEC scenarios

The tests are successful even if the public keys are not stored locally,
but an additional DNS query is required to fetch them.
testing: Update PKCS#8 keys
testing: Update PKCS#12 containers
testing: Make sure the whitelist plugin is ready before configuring it
testing: Actually build swanctl
testing: Wait a bit in swanctl scenarios before interacting with the daemon
testing: Updated swanctl certificates and keys
Allow to treat specified Attribute-Type-Not-Supported errors as non-fatal
Implemented IF-M segmentation contracts
Added request variable to get_info_string method
Implemented IF-M segmentation
Added out message queue for imv_msg receive method
Merged libpts into libimcv