Installs specific toolset on CI system.

def install_toolset(self, toolset):
        '''
        Installs specific toolset on CI system.
        '''
        info = toolset_info[toolset]
        if sys.platform.startswith('linux'):
            os.chdir(self.work_dir)
            if 'ppa' in info:
                for ppa in info['ppa']:
                    utils.check_call(
                        'sudo','add-apt-repository','--yes',ppa)
            if 'deb' in info:
                utils.make_file('sources.list',
                    "deb %s"%(' '.join(info['deb'])),
                    "deb-src %s"%(' '.join(info['deb'])))
                utils.check_call('sudo','bash','-c','cat sources.list >> /etc/apt/sources.list')
            if 'apt-key' in info:
                for key in info['apt-key']:
                    utils.check_call('wget',key,'-O','apt.key')
                    utils.check_call('sudo','apt-key','add','apt.key')
            utils.check_call(
                'sudo','apt-get','update','-qq')
            utils.check_call(
                'sudo','apt-get','install','-qq',info['package'])
            if 'debugpackage' in info and info['debugpackage']:
                utils.check_call(
                    'sudo','apt-get','install','-qq',info['debugpackage'])