Abstracted config file content lookup

In preparation for alternate content determination method
Rename installServices to installServiceDefinitions
Move normalizeService to class scope

Add unit tests
Abstract getDaemonPath()
Default zenpack collector service definition
Run daemon from daemon directory

Run from daemon directory rather than bin directory so that in the future
we will not need to install the daemon into Products/bin.
Update documentation
Merge pull request #210 from zenoss/feature/defaultZenpackService

Feature/default zenpack service