VMM/cli/subcommands: Corrected username's usage string.
username's name argument is optional.
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Release history of vmm
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Version Release Date Download URL
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vmm-0.6.0 Jun 28 2012 https://sourceforge.net/projects/vmm/files/vmm/0.6.0
vmm-0.5.2 Sep 09 2009 https://sourceforge.net/projects/vmm/files/vmm/0.5.2
vmm-0.5.1 Aug 12 2009 https://sourceforge.net/projects/vmm/files/vmm/0.5.1
vmm-0.5 Nov 27 2008 https://sourceforge.net/projects/vmm/files/vmm/0.5
vmm-0.4-r41 May 02 2008 https://sourceforge.net/projects/vmm/files/vmm/0.4-r41
vmm-0.4 May 01 2008 https://sourceforge.net/projects/vmm/files/vmm/0.4
vmm-0.3.1 Jan 08 2008 https://sourceforge.net/projects/vmm/files/vmm/0.3.1
vmm-0.3 Jan 06 2008 https://sourceforge.net/projects/vmm/files/vmm/0.3
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