Github user rhtyd commented on the issue:
https://github.com/apache/cloudstack/pull/1633
@wido I'm sorry we will need to support CentOS6 kvm hosts, just because you
don't use it does not mean we should not support for people. It is a valid
`blocker` as the KVM CentOS6 hosts have stopped working from deploying VMs.
`optparse` is deprecated which does not mean that it will fail or won't be
available. We can have another way of fixing this: (1) revert #1533, (2) add a
package dependency `python-argparse` on (at least centos6) rpms to ensure that
argparse will be available on centos6/7 hosts. Which way should we go, if not
the way PR fixes it?
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