QUIC: Handle CRYPTO frames across multiple INITIAL packets

Instead of sending the accumulated CRYPTO frames after processing an
INITIAL packet, add logic to determine the total length of the TLS
Client or Server Hello (by peeking into the first 4 byte). Once all
CRYPTO frames have arrived, flush the reassembled data to the TLS
analyzer at once.

testing/btest/Baseline/scripts.base.protocols.quic.multiple-initial-fragmented-crypto-only-initial/conn.log.cut

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+ts	uid	history	service
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	D	quic,ssl

testing/btest/Baseline/scripts.base.protocols.quic.multiple-initial-fragmented-crypto-only-initial/quic.log.cut

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+ts	uid	server_name	history
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	googleads.g.doubleclick.net	IIIS

testing/btest/Baseline/scripts.base.protocols.quic.multiple-initial-fragmented-crypto-only-initial/ssl.log.cut

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+ts	uid	version	cipher	curve	server_name	resumed	last_alert	next_protocol	established	ssl_history
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	-	-	-	googleads.g.doubleclick.net	F	-	-	F	C

testing/btest/Baseline/scripts.base.protocols.quic.multiple-initial-fragmented-crypto/conn.log.cut

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+ts	uid	history	service
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	Dd	quic,ssl

testing/btest/Baseline/scripts.base.protocols.quic.multiple-initial-fragmented-crypto/quic.log.cut

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+ts	uid	server_name	history
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	googleads.g.doubleclick.net	IIISZZZiIiIIIIIIZ

testing/btest/Baseline/scripts.base.protocols.quic.multiple-initial-fragmented-crypto/ssl.log.cut

@@ -0,0 +1,3 @@
+### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
+ts	uid	version	cipher	curve	server_name	resumed	last_alert	next_protocol	established	ssl_history
+XXXXXXXXXX.XXXXXX	CHhAvVGS1DHFjwGM9	-	-	-	googleads.g.doubleclick.net	F	-	-	F	C

testing/btest/scripts/base/protocols/quic/multiple-initial-fragmented-crypto-only-initial.zeek

@@ -0,0 +1,12 @@
+# @TEST-DOC: Pcap with CRYPTO frames fragemented over multiple INITIAL packets. The pcap only contains 3 INITIAL packets. Check what logs are created.
+
+# @TEST-REQUIRES: ${SCRIPTS}/have-spicy
+# @TEST-EXEC: zeek -Cr $TRACES/quic/quic-multiple-initial-fragmented-crypto-only-initial.pcap base/protocols/quic
+# @TEST-EXEC: test ! -f analyzer.log
+# @TEST-EXEC: test ! -f dpd.log
+# @TEST-EXEC: zeek-cut -m ts uid history service < conn.log > conn.log.cut
+# @TEST-EXEC: btest-diff conn.log.cut
+# @TEST-EXEC: zeek-cut -m ts uid server_name history < quic.log > quic.log.cut
+# @TEST-EXEC: btest-diff quic.log.cut
+# @TEST-EXEC: zeek-cut -m ts uid version cipher curve server_name resumed last_alert next_protocol established ssl_history < ssl.log > ssl.log.cut
+# @TEST-EXEC: btest-diff ssl.log.cut

testing/btest/scripts/base/protocols/quic/multiple-initial-fragmented-crypto.zeek

@@ -0,0 +1,12 @@
+# @TEST-DOC: Pcap with CRYPTO frames fragemented over multiple INITIAL packets.
+
+# @TEST-REQUIRES: ${SCRIPTS}/have-spicy
+# @TEST-EXEC: zeek -Cr $TRACES/quic/quic-multiple-initial-fragmented-crypto.pcap base/protocols/quic
+# @TEST-EXEC: test ! -f analyzer.log
+# @TEST-EXEC: test ! -f dpd.log
+# @TEST-EXEC: zeek-cut -m ts uid history service < conn.log > conn.log.cut
+# @TEST-EXEC: btest-diff conn.log.cut
+# @TEST-EXEC: zeek-cut -m ts uid server_name history < quic.log > quic.log.cut
+# @TEST-EXEC: btest-diff quic.log.cut
+# @TEST-EXEC: zeek-cut -m ts uid version cipher curve server_name resumed last_alert next_protocol established ssl_history < ssl.log > ssl.log.cut
+# @TEST-EXEC: btest-diff ssl.log.cut