shell: Move find_logical_volume_block to file scope

Reviewed-by: Stef Walter <stefw@redhat.com>
shell, daemon: Optionally resize filesystem together with logical volume

And provide a good default.

Fixes #1129
Reviewed-by: Stef Walter <stefw@redhat.com>
test: Depend on storaged 0.3.1

For the 'resize_fsys' option.

Reviewed-by: Stef Walter <stefw@redhat.com>
test: Enable updates-testing for mock

Reviewed-by: Stef Walter <stefw@redhat.com>
test: Check resizing of mounted filesystems

Closes #1173
Reviewed-by: Stef Walter <stefw@redhat.com>