Update the features.rst file with newly DONE items
Add the bd_lvm_pvmove function
Add the bd_lvm_pvscan function
Make conditions including g_strcmp0 more explicit

Just in case.
Add helper function for calling lvm and capturing output

It will come handy for some of the functions in the plugin.
Add a helper function for parsing LVM variables

Needed for some of the future functions in the plugin.
Allow boilerplategenerator skipping some parts of the files

Some parts have no relation to the boilerplate code we need to generate so they
can be marked as such and skipped.
Add missing parameter name in bd_is_plugin_available protype