[SEBA-497]

Change to using alpine-grpc-base
Fix issue with nested exceptions causing an error in structlog
Reformat and python3 fixes, v3.5 mock support
Record execution times in the loader

Change-Id: I6d7923818d57012fca32ce44668820de422206d6
diff --git a/.dockerignore b/.dockerignore
index 5465185..8a56dfc 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -4,3 +4,6 @@
 test
 Dockerfile
 Makefile
+venv-tosca
+.coverage
+.tox