tests: update environment test config (#178)

Author: daniel-sanche

.kokoro/environment/appengine_flex_container/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment/appengine_flex_python/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment/appengine_standard/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment/cloudrun/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment/compute/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment/functions/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment/kubernetes/common.cfg

@@ -30,5 +30,5 @@ env_vars: {
 }
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "python-logging/.kokoro/environment_tests.sh"
+    value: "github/python-logging/.kokoro/environment_tests.sh"
 }

.kokoro/environment_tests.sh

@@ -20,7 +20,14 @@ if [[ -z "${ENVIRONMENT:-}" ]]; then
   exit 1
 fi
 
-cd python-logging/tests/environment
+if [[ -z "${PROJECT_ROOT:-}"  ]]; then
+    PROJECT_ROOT="github/python-logging"
+fi
+
+# make sure submodule is up to date
+git submodule update --init --recursive
+
+cd "${PROJECT_ROOT}/tests/environment"
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1