add a placeholder of ifconfig scanner
force children classes of sos_analyzer.analyzer.base.Analyzer implement the method 'analyze'
move dic_get_recur (and its test cases) from sos_analyzer.scanner.base to sos_analyzer.utils
add a method 'getconf' to make to configuration parameters much easier
add 'installed-rpms' scanner
added an experimental analyzer for running/boot default/installed kernels
rename and add function to run analyzers along with scanners
add some method templates for child analyzer classes
fix a few bugs: make it referes self.workdir, etc.
make it loading sos_analyzer.runner instead of (old) sos_analyzer.scanners and enable analyzers
disable ifconfig scanner by default as it's not completed yet
shorten some dict key names in results
fix the regex for the date part in installed_rpms
rename and add a test case to make analyzer instances