AppDynamics Node Name from Instance Index

Previously, AppDynamics node names were based on the instance's id.
This led to a proliferation of instances in the AppDynamics console
which hindered usability.  This change now uses the instance's index
for its node name.  This will lead to fewer instances in the
AppDynamics console, improving usability.

[#75252406][#55]
Merge branch 'cgfrost-75252406-AppDynamics-nodeName'

[resolves #83]
Merge remote-tracking branch 'upstream/master'