Move to use argparse, fix issues with multiple --env cmdline options

llama_stack/distribution/start_conda_env.sh

@@ -58,9 +58,8 @@ eval "$(conda shell.bash hook)"
 conda deactivate && conda activate "$env_name"
 
 set -x
-echo "ENV VARS $env_vars"
 $CONDA_PREFIX/bin/python \
   -m llama_stack.distribution.server.server \
-  --yaml_config "$yaml_config" \
+  --yaml-config "$yaml_config" \
   --port "$port" \
-  "$env_vars"
+  $env_vars