Bring back async_cmd_check to check for parallel extension install completion and fix dry-run mode with parallel extensions - #5223

Bring back async_cmd_check to check for parallel extension install completion and fix dry-run mode with parallel extensions#5223

Flamefire wants to merge 4 commits into

easybuilders:developeasybuilders/easybuild-framework:developfrom

Flamefire:parallel-ext-install-fixFlamefire/easybuild-framework:parallel-ext-install-fixCopy head branch name to clipboard