remove unnecessary imports and statements

openfold/data/tools/parse_msa_files.py

-import os, multiprocessing, argparse, pickle, tempfile, concurrent
-import multiprocessing.pool # Need to import multiprocessing.pool first otherwise multiprocessing.pool.Pool cannot be called
+import os, argparse, pickle, tempfile, concurrent
 from openfold.data import parsers
 from concurrent.futures import ProcessPoolExecutor
 
@@ -9,7 +8,6 @@ def parse_stockholm_file(alignment_dir: str, stockholm_file: str):
     with open(path, "r") as infile:
         msa = parsers.parse_stockholm(infile.read())
         infile.close()
-    # queue.put()
     return {file_name: msa}
 
 def parse_a3m_file(alignment_dir: str, a3m_file: str):
@@ -18,7 +16,6 @@ def parse_a3m_file(alignment_dir: str, a3m_file: str):
     with open(path, "r") as infile:
         msa = parsers.parse_a3m(infile.read())
         infile.close()
-    # queue.put({file_name: msa})
     return {file_name: msa}
 
 def run_parse_all_msa_files_multiprocessing(stockholm_files: list, a3m_files: list, alignment_dir:str):