Adds extra db connection options to suprsync agent

[jlashner]

Adds configuration options to suprsync agents to echo DB commands, and increase pool and overflow limits.

Motivation and Context

This is to try to fix #734.

How Has This Been Tested?

This is currently running on SATP2. I don't know yet whether it will actually help with the crashes, but I think its not a bad idea for these options to be merged anyway.

Types of changes

• 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 not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[BrianJKoopman]

Looks good to me!