Description of problem:
Running BoxGrinder-build which uses guestfs and augeas, augeas throws a seg fault during aug_save.

Version-Release number of selected component (if applicable):
0.7.3

How reproducible:
Every time I run boxgrinder-build, it occurs.

Steps to Reproduce:
1. Create a basic appliance defintion
2. Run boxgrinder with trace logging
3. Error is in log file
  
Actual results:
guestfsd[285]: segfault at ff044cc ip 037666d2 sp bf968d40 error 4 in libaugeas.so.0.12.0[3747000+39000]

Expected results:
No segfault

Additional info:
Log file and appliance definitions from boxgrinder: https://gist.github.com/671166