Added Pending Reboot check

[carceneaux]

Pull Request Template

By contributing, you agree that your contributions will be licensed under the projects original open source license.

Description

If a pending reboot flag is present prior to performing a Veeam Install/Upgrade, it can cause failures in the automation.

• Added a pending reboot check to the pretask list of the following:
  • EM install
  • EM upgrade
  • VBR install
  • VBR upgrade
• Added a pending reboot check to the post-task list of the following:
  • EM install
  • VBR install
• While the post-check isn't required from a Veeam standpoint, it's good practice.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Tested in a lab environment.

Checklist (check all applicable):

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard to understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes