Added nested virtualization support to autoamtion-tools.

This support is intentionally kept optional, as nested_virt is
not enabled by default. That is this module is not loaded by the
kernel until set.
Configures the needed module to enable nested virtualization
Merge pull request #84 from kbidarkar/add-provisioning-support

Added nested virtualization support to autoamtion-tools.
Merge pull request #85 from kbidarkar/check-nested-support

Configures the needed module to enable nested virtualization
Update egrep to grep -E

    egrep is the same as grep -E. fgrep is the same as grep -F. rgrep is the
    same as grep -r. Direct invocation as either egrep or fgrep is
    deprecated, but is provided to allow historical applications that rely
    on them to run unmodified.
Merge pull request #86 from elyezer/deprecate-egrep

Update egrep to grep -E
Normalize distribution argument to lower case

Do not force users to type lowercase when running product_install task.
Merge pull request #87 from elyezer/distrib-lower

Normalize distribution argument to lower case