Adding a few #nosec tags to prepare for Bandit usage

This commit adds a few #nosec tags for non-issues.  I've examined
the code and determined that these don't represent security issues
so we should add a #nosec tag that tells Bandit not to find these
issues in the future.

Closes-Bug: #1577498
Change-Id: Ic37216c08442c700c64118c78cfb46e6cedd237c