base_folder/head contains two folders with startup-os repos

[val-fed]

The issue:
/path/to/base/folder/head/ contains two folders with startup-os repos after aa init command:

• startup_os
• startup-os

Steps to reproduce it:

• Clone startup-os repo to some location on your PC using git clone https://github.com/google/startup-os.git.
• Go to /path/to/startup-os-folder/startup-os and run ./test.sh script to make sure that everything works.
• Run bazel run //tools/reviewer/aa:aa_tool -- init --base_path </path/to/base/folder> command to init a base folder.