Fast fix for rsync upload

This code need refactoring, which I do after scp support removal
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Add dependency to rsync and openssh-clients
Upstart support for CentOS 6
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Send more detailed info about hosting OS

(python version, platform, linux distributive and it version  if we on
linux)
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force change dir to bin/../

This change allow to do "vagrant ssh build -- cleverdb-agent/bin/build"
CentOS7 related fixes and cleanups in specfile
Remove obsoleted scp support
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Add missing "enable" stanza in systemd postinstall actions
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