Specify color for application instead of it being generated from the name.

[sirmspencer]

Feature

Specify color for application instead of it being generated from the name. (/traces page)

Rationale

To cases are an issue

1. two of our servers generate basically the same color
2. We are starting to tag local logs with "local service 1", which makes it a different color. Its easier to follow if the same services is always the same color.

Example Scenario

In a system of micro serves there is likely to be app names that generate similar colors.