Add method to return VM Hardware

[agrare]

When reconfiguring a VM there are a number of steps that need to operate on the VM's config.hardware hash. Add a method to retrieve this once and allow it to be passed in to other methods to reduce the number of retrieveProperties calls made to the provider.

https://bugzilla.redhat.com/show_bug.cgi?id=1445874

[blomquisg]

I set this to fine/no b/c the BZ didn't request it. I could just as easily see this going into a Fine point release, if anyone wants it.

[simaishi]

Euwe backport (to manageiq repo) details:

$ git log -1
commit df76a520dd47977fcd2358dd1b980846202eec99
Author: Greg Blomquist <[email protected]>
Date:   Thu May 4 14:19:14 2017 -0400

    Merge pull request #148 from agrare/bz_1445874_return_vm_hardware
    
    Add method to return VM Hardware
    (cherry picked from commit 6e38517e8be67f5310e19f843a9fb306e0da7d4b)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1452172

[simaishi]

Fine backport details:

$ git log -1
commit b06c7b2601b7f038bc8a46d2bd2e87d4c6d8ac56
Author: Greg Blomquist <[email protected]>
Date:   Thu May 4 14:19:14 2017 -0400

    Merge pull request #148 from agrare/bz_1445874_return_vm_hardware
    
    Add method to return VM Hardware
    (cherry picked from commit 6e38517e8be67f5310e19f843a9fb306e0da7d4b)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1459262