yyoom tool accepts new parameters --log-file and --quiet

Changed command prompt parameters for yyoom tool.
There are two new parameters:
--log-file to set path to log file
--quiet write only error information in err
yum_helper now calls execute istead of execute_save_output2

Change-Id: I4e5583a902d2243e99b34664055b5e65be83868d
Merge "yyoom tool accepts new parameters --log-file and --quiet"