tests: add submodule for lnprototests (points at branch right now)

Branch has fix for break in test_query_channel_range

.gitmodules

@@ -14,3 +14,8 @@
 [submodule "external/gheap"]
 	path = external/gheap
 	url = https://github.com/valyala/gheap
+[submodule "external/lnprototest"]
+	path = external/lnprototest
+	url = https://github.com/niftynei/lnprototest.git
+	branch = nifty/small-edits
+	ignore = dirty

external/Makefile

@@ -3,7 +3,8 @@ SUBMODULES =					\
 	external/libwally-core			\
 	external/gheap				\
 	external/jsmn				\
-	external/libbacktrace
+	external/libbacktrace			\
+	external/lnprototest
 
 TOP := ../..
 ifdef BUILD

requirements.txt

@@ -38,4 +38,10 @@ pysocks ~= 1.7.1
 # Dependencies from pyln-spec
 # None
 
-
+# Dependencies from lnprototest
+pyln.bolt1==1.0.1.137
+pyln.bolt2==1.0.1.137
+pyln.bolt4==1.0.1.137
+pyln.bolt7==1.0.1.137
+coincurve==13.0.0
+crc32c