attempt to fix tests (also disable Valgrind)

Author: funbringer

.travis.yml

@@ -18,10 +18,8 @@ notifications:
         on_failure: always
 
 env:
-    - PG_VERSION=10 LEVEL=nightmare
     - PG_VERSION=10 LEVEL=hardcore
     - PG_VERSION=10
-    - PG_VERSION=9.6 LEVEL=nightmare
     - PG_VERSION=9.6 LEVEL=hardcore
     - PG_VERSION=9.6
     - PG_VERSION=9.5 LEVEL=hardcore

Dockerfile.tmpl

@@ -5,7 +5,7 @@ RUN apk add --no-cache \
 	openssl curl \
 	cmocka-dev \
 	perl perl-ipc-run \
-	python3 python3-dev py-virtualenv \
+	python3 python3-dev py3-virtualenv \
 	coreutils linux-headers \
 	make musl-dev gcc bison flex \
 	zlib-dev libedit-dev \

tests/python/partitioning_test.py

@@ -19,7 +19,6 @@
 
 from distutils.version import LooseVersion
 from testgres import get_new_node, get_pg_version
-from testgres.utils import pg_version_ge
 
 # set setup base logging config, it can be turned on by `use_logging`
 # parameter on node setup