Config parsing does not handle error very well

[degremont]

Configuration parsing has trouble to detect some errors or report them in a clear way.
By example:

Bad error message when some '---' line is not set
If 2 consecutives services are declared in a YAML file, but "---" is missing, the error message will be:

ERROR: Unexpected exception: 'service2_name' 

With a configuration with 2 services with the same name, milkcheck uses the last one without any warning message

$ cat conf/two/example.yaml
services:
    local:
       desc: Simplest service declaration
       actions:
          status:
             cmd: /sbin/service crond status
    local:
       desc: Simplest service declaration (double definition)
       actions:
          start:
             cmd: /bin/true

$ milkcheck -c conf/two status
$ milkcheck -c conf/two start
local - Simplest service declaration (double definition) [ OK ]

A interesting method to fix this could be to use the advanced features from PyYAML library and see if we cannot overload/create new classes to parse the yaml stream and automatically instanciate objects.