vdc-manage: fix "host modify" options not to overwrite with default values.
vdc-manage: fix "nfs/iscsistorage modify" not to overwite with default values.
Patch Thor class to allow overwrite method_option attribute.
vdc-manage: refactor network common options.
vdc-manage: refactor backup_storage common options.
vdc-manage: refactor keypair common options.
vdc-manage: refactor security_group common options.
vdc-manage: refactor backup_object common options.
vdc-manage: takes out default from host subcommand common opts.
vdc-manage: takes out default from storage subcommand common opts.
vdc-manage: takes out default from network subcommand common opts.
vdc-manage: refactor resource_group common options.
Revert "Changed the database column for windows' password from varchar to text."

This reverts commit b4084256e73d9b7540ee1936e9a5ac986182744b.
Added a new migration file that changes the encrypted_password column value
Changed example dhcp range in the install demo data script
Merge pull request #472 from axsh/install-demo-script-dhcp-range

install demo data script dhcp range (ci skip)
Merge pull request #469 from axsh/fix-cli-params

Fix unexpected field value changing for "vdc-manage host modify" and "vdc-manage storage modify"
Merge pull request #470 from axsh/bugfix-windows-password-database

Windows password database column bugfix
vdc-manage: fix --arch is validated always at "host modify".
kvm: fix migration incoming port was set as array value.

wrong option string was built such like "-incoming tcp:0.0.0.0:[999999]" so
that the incoming mode qemu process was failing to start.