api: fix include_guard when path contains a plus

The path to VPP source might contain a '+' when building it
with Yocto/OpenEmbedded.

Type: fix

Signed-off-by: Ruslan Babayev <ruslan@babayev.com>
Change-Id: I205ac0de7d8726724af0e30f5b199391e05dc615

src/vpp-api/vapi/vapi_c_gen.py

@@ -691,7 +691,7 @@ def gen_json_unified_header(parser, logger, j, io, name):
     orig_stdout = sys.stdout
     sys.stdout = io
     include_guard = "__included_%s" % (
-        j.replace(".", "_").replace("/", "_").replace("-", "_"))
+        j.replace(".", "_").replace("/", "_").replace("-", "_").replace("+", "_"))
     print("#ifndef %s" % include_guard)
     print("#define %s" % include_guard)
     print("")