Change in vdsm[master]: beautify and better __exit__ strategy

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Change subject: beautify and better __exit__ strategy
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Patch Set 1: Code-Review-1 Verified-1

Build Unstable

http://jenkins.ovirt.org/job/vdsm_master_unit_tests_gerrit_el/11246/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_unit-tests_created/12188/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_pep8_gerrit/12035/ : UNSTABLE