improved OpenNebula-based job handling
o: renamed variables
zhelpers and sslhelpers: removed code from header to source file
refactoring the sourcing of vishnurc to simplify the call
added missing header regarding the refactoring in zhelper
added zhelpers.cpp in CMakeList.txt
added missing method to pool OpenNebula Queue info
added additional environment for monitoring cloud job
simplify the execution and the process of monitoring OpenNebula cloud jobs
cleaning and updates to ease the monitoring of cloud jobs and the handling of jobs execution through ssh.
removed using namespace std, plus clean
fixed crash problem in getJobOutput
fixed path for stderr and stdout for opennebula cloud jobs
added 'const' keyword where appropriate on method signature
refactoring vishnu::getGeneratedName : use std::string instead of char *
first step towards removing database-based configuration parameter in vishnu
fixed UMS tests
removed unrequired files
changed machine and user identifier template
removed deprecated code and model definition