installer: windows event log messages are hard to read

[martinlindhe]

@carlpett wrote

since we do not have a "MessageFile", all eventlog messages are prefixed with a few paragraphs about not knowing how to format the message. The message itself turns up at the end, so not a deal breaker, but pretty irritating.

Three options:

1. Ignore it
2. Create a message file. This is a bit bothersome, sadly, and requires a few winsdk tools to compile.
3. Piggyback on some existing message file. This will create an implicit dependency though, so not very nice (eg to the .net framework)

(related to msi installer, introduced in #19)

[carlpett]

Another thing that should be considered as well here, every log.Whatever results in a separate log event in the Windows Event log. For that reason I merged the "enabled collectors" log output, but we may want to do another pass over this to see if there are other places where there are multiline logs done like this.

[kardianos]

FYI: it is easy to get around the whole missing "MessageFile" thing. When installing, use: https://godoc.org/golang.org/x/sys/windows/svc/eventlog#InstallAsEventCreate . That's effectively what github.com/kardianos/service does.

[carlpett]

@kardianos Aha, I had missed that, thanks a lot! Will give it a shot as soon as I get a chance!