Better logging of stderr/popen problems

[jfriesse]

Some of the problems are visible only when booth is running in console/standalone because they don't get into syslog. 2 examples of problems I've hit:

1. Pacemaker was reporting deprecated calling of crm_ticket (using dash argument without space - reason for PR#130). This could be solved by enhancing popen/refactoring popen (issue #136)
2. glib were reporting problems when using glib hash table (PR #125).

I'm not entirely sure what is the best solution for this problem, but maybe redirecting of stderr into pipe which is then logged by booth might be the solution.