conf: Document options of plugins in libpts

conf/plugins/imc-attestation.opt

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+charon.plugins.imc-attestation.aik_blob =
+	AIK encrypted private key blob file.
+
+charon.plugins.imc-attestation.aik_cert =
+	AIK certificate file.
+
+charon.plugins.imc-attestation.aik_key =
+	AIK public key file.
+
+charon.plugins.imc-attestation.nonce_len = 20
+	DH nonce length.
+
+charon.plugins.imc-attestation.use_quote2 = yes
+	Use Quote2 AIK signature instead of Quote signature.
+
+charon.plugins.imc-attestation.pcr_info = yes
+	Whether to send pcr_before and pcr_after info.

conf/plugins/imc-swid.opt

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+charon.plugins.imc-swid.swid_directory = ${prefix}/share
+	Directory where SWID tags are located.

conf/plugins/imv-attestation.opt

@@ -0,0 +1,29 @@
+charon.plugins.imv-attestation.cadir =
+	Path to directory with AIK cacerts.
+
+charon.plugins.imv-attestation.dh_group = ecp256
+	Preferred Diffie-Hellman group.
+
+charon.plugins.imv-attestation.hash_algorithm = sha256
+	Preferred measurement hash algorithm.
+
+charon.plugins.imv-attestation.min_nonce_len = 0
+	DH minimum nonce length.
+
+charon.plugins.imc-attestation.pcr17_after
+	Dummy data if the TBOOT log is not retrieved.
+
+charon.plugins.imc-attestation.pcr17_before
+	Dummy data if the TBOOT log is not retrieved.
+
+charon.plugins.imc-attestation.pcr17_meas
+	Dummy data if the TBOOT log is not retrieved.
+
+charon.plugins.imc-attestation.pcr18_after
+	Dummy data if the TBOOT log is not retrieved.
+
+charon.plugins.imc-attestation.pcr18_before
+	Dummy data if the TBOOT log is not retrieved.
+
+charon.plugins.imc-attestation.pcr18_meas
+	Dummy data if the TBOOT log is not retrieved.