HWP supervisor iboot indexing bugfix

[bbixler500]

Changes how the supervisor indexes iboot outlets when querying their state. This change only effects how the outlet states are reported in the monitor session data (actual functions using the iboot outlets are uneffected)

Description

Subtracts one from the supplied outlet number, as the iboot outlets are indexed 0-7 while the outlet input argument is indexed 1-8.

Motivation and Context

This fix ensures that the session data is accurate. Additionally, the supervisor agent would previously crash with an index error whenever trying to use outlet 8 (which is the case for the satp2 gripper power supplies)

How Has This Been Tested?

I tested this fix with the satp2 hwp.
Outlet states:

Before change:

After change:

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.

[jlashner]

Looks good to me, thanks bryce!