print the env vars in a copy/pastable way

Author: lerouxb

.evergreen/preinstall.sh

@@ -13,9 +13,9 @@ echo "APPDATA: $APPDATA"
 echo "PATH: $PATH"
 
 # these are super useful if you want to run the smoke tests locally
-echo "DEV_VERSION_IDENTIFIER: $DEV_VERSION_IDENTIFIER"
-echo "EVERGREEN_BUCKET_NAME: $EVERGREEN_BUCKET_NAME"
-echo "EVERGREEN_BUCKET_KEY_PREFIX: $EVERGREEN_BUCKET_KEY_PREFIX"
+echo "export DEV_VERSION_IDENTIFIER=$DEV_VERSION_IDENTIFIER"
+echo "export EVERGREEN_BUCKET_KEY_PREFIX=$EVERGREEN_BUCKET_KEY_PREFIX"
+echo "export EVERGREEN_BUCKET_NAME=$EVERGREEN_BUCKET_NAME"
 
 echo "IS_OSX: $IS_OSX"
 echo "IS_LINUX: $IS_LINUX"