Wrap submodule command with a string

What does this MR do?

Wrap submodule command with a string

Why was this MR needed?

Upgrading to Git 2.22, breaks the scenario when you have a Git repository with submodules and GIT_SUBMODULE_STRATEGY is set to recursive.

The command git submodule foreach --recursive git clean -ffxd is build and this works fine in Git <2.21 but in Git 2.22 it fails with the following error error: unknown switch f'the reason for this is because Git seems to be thinking that-ffxdis a flag forgit submoduleand not forgit clean`. Wrapping the commands with single quotes to fix this issue.

Are there points in the code the reviewer needs to double check?

• Git 1.7
• Should we add additional tests

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Added tests for this feature/bug
• In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Closes #4352 (closed)