fixed missing validation as issue #136

[fernandesdba]

Description

I added 2 validations 1- Check if the given DB has at least a full bkp (snapshot) 2- Check if the AG is AUTO SEED ON, if so, will join the DB on AG only at Primary Replica.

Related Issue

136

This project only accepts pull requests related to open issues.

How Has This Been Tested?

I tested on Rangers lab

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply. If you're unsure about any of these, don't hesitate to ask. We're here to help!

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTION document.
• [ ] I have updated the CHANGELOG file accordingly for the version that this merge modifies.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.