pyln.spec.bolt*: make these separate packages, so versions can change indep.

They're almost entirely autogenerated, and we use symlinks into the
top directory to reduce replication.

They can't be under pyln.spec.message, because a package can't also
be a namespace.

We also add fulltext and desc fields, and exclude our "gen" files from
flake8, since the spec quotes contain weird whitespace.

Changelog-Added: Python: pyln.spec.bolt{1,2,4,7} packages.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

contrib/pyln-spec/subinit.py

@@ -0,0 +1,20 @@
+# This is the same __init__.py for all bolt dirs.
+from .gen import csv, text, desc
+from .gen_version import __version__, __gitversion__
+from .bolt import namespace
+import sys
+
+__all__ = [
+    'csv',
+    'text',
+    'desc',
+    'namespace',
+    '__version__',
+    '__gitversion__',
+]
+
+mod = sys.modules[__name__]
+for d in namespace.subtypes, namespace.tlvtypes, namespace.messagetypes:
+    for name in d:
+        setattr(mod, name, d[name])
+        __all__.append(name)