[master] Stop using egrep

[Rudd-O]

What does this PR do?

When egrep is used, a nasty warning from grep saying egrep should be replaced by grep -E appears on the executed command. This leads to failure matching returned values from semanage fcontext.

This fix fixes it.

What issues does this PR fix or reference?

Have not noticed any bugs reported on this.

Previous Behavior

Failure running selinux.fcontext_policy_present.

New Behavior

It works.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• [ ] Docs
• [ ] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• [ ] Tests written/updated

Commits signed with GPG?

No

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