improve system tests

- log import errors for test modules
- log output only on test failure
- improve docker system test container
- use go 1.19 in docker system tests
- download go dependencies in docker container
- system tests: color failues output
- imrpove test result output
- do not install golangci-lint in system tests

system/t06_publish/list.py

@@ -12,6 +12,7 @@ class PublishList2Test(BaseTest):
     """
     publish list: several repos list
     """
+    requiresGPG2 = True
     fixtureDB = True
     fixturePool = True
     fixtureCmds = [
@@ -30,6 +31,7 @@ class PublishList3Test(BaseTest):
     """
     publish list: several repos list, raw
     """
+    requiresGPG2 = True
     fixtureDB = True
     fixturePool = True
     fixtureCmds = [
@@ -54,6 +56,7 @@ class PublishList5Test(BaseTest):
     """
     publish list json: several repos list
     """
+    requiresGPG2 = True
     fixtureDB = True
     fixturePool = True
     fixtureCmds = [