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Description of problem:
In the bash-completion are missing some options and commands for git (eg. merge-base). 

[matthias@adzh-srlp-jmp02 ~]$ git merge (TAB)
merge       mergetool   

Version-Release number of selected component (if applicable):
bash-completion-2.1-6.el7.noarch
git-1.8.3.1-5.el7.x86_64

How reproducible:
Every time

Steps to Reproduce:
1. git merge
2. Press tab
3. only merge mergetool is shown, merge-base not

Actual results:
See steps to Reproduce

Expected results:
Every git command should be shown, when useing bash-completion

git completions are provided by git package. Re-assigning to git component.

That's true.

Completion is intentionally not listing "merge-base" command.
"merge-base" is a low-level command with intention to use in scripts.

References:
https://marc.info/?l=git&m=157926852809290&w=4
https://github.com/git/git/blob/v2.25.0/command-list.txt#L120