Update runSaltCommand command to support batch

- ability to manage batch size with SALT_MASTER_OPT_WORKER_THREADS
  env variable even if batch not specified directly;
- contains parsing of local_batch client responses;
- Add batch option to most popular functions which lead to
  runSaltCommand use batches;

Related: PROD-27850 (PROD:27850)
Related: PROD-32646 (PROD:32646)

Change-Id: I0d4a1195285c35503474097d7dafd38f5bbb9ac3
(cherry picked from commit f79769598651e2a1cda8ca836e1a244ea4b8f94d)
2 files changed