Fix export resource for Chef 12.5.1 compatibility

[davidgiesberg]

Compilation fails under Chef 12.5.1 (worked fine in 12.3.1)

================================================================================
       Recipe Compile Error in /tmp/kitchen/cookbooks/nfs_test/recipes/issue46.rb
       ================================================================================

       Chef::Exceptions::ValidationFailed

       Option network must be one of: required!  You passed "127.0.0.1".

       Cookbook Trace:
       ---------------
         /tmp/kitchen/cookbooks/nfs_test/recipes/issue46.rb:11:in `block in from_file'

This fix works for me

[martinb3]

👍 we're also seeing this.

[joerocklin]

Running through some kitchen tests to make sure all looks good there (just to make sure), and then will merge it in (unless @atomic-penguin has an objection).

[joerocklin]

All looks good with my tests - I wanted to make sure it didn't break anything with clients prior to 12.5 (I checked 12.4 and 11.18). I'll get the rest of the pieces together and bump the version. But I can't upload to the chef supermarket, so we'll have to wait for @atomic-penguin for that.

[joshzitting]

yes! good fix we need this asap! thanks!