RPM issues - workaround in place

[asamalik]

0b50d59 contains a workaround of an rpm issue:

2017-09-19 11:54:43,622 DEBUG pylorax.ltmpl: running command: ('chroot', '/var/tmp/lorax.57gx60vw/installtree', '/usr/bin/rpm', '-qa', '--pipe', 'tee /root/lorax-packages.log')
2017-09-19 11:54:43,631 ERROR pylorax.ltmpl: command output:
error: db5 error(-30969) from dbenv->open: BDB0091 DB_VERSION_MISMATCH: Database environment version mismatch
error: cannot open Packages index using db5 -  (-30969)
error: cannot open Packages database in /var/lib/rpm
error: db5 error(-30969) from dbenv->open: BDB0091 DB_VERSION_MISMATCH: Database environment version mismatch
error: cannot open Packages index using db5 -  (-30969)
error: cannot open Packages database in /var/lib/rpm

2017-09-19 11:54:43,631 ERROR pylorax.ltmpl: command returned failure (1)
2017-09-19 11:54:43,632 ERROR pylorax.ltmpl: template command error in runtime-postinstall.tmpl:
2017-09-19 11:54:43,632 ERROR pylorax.ltmpl:   runcmd chroot /var/tmp/lorax.57gx60vw/installtree /usr/bin/rpm -qa --pipe tee /root/lorax-packages.log
2017-09-19 11:54:43,634 ERROR pylorax.ltmpl:   subprocess.CalledProcessError: Command '['chroot', '/var/tmp/lorax.57gx60vw/installtree', '/usr/bin/rpm', '-qa', '--pipe', 'tee /root/lorax-packages.log']' returned non-zero exit status 1.
2017-09-19 11:54:43,634 DEBUG pylorax.ltmpl:   Traceback (most recent call last):
2017-09-19 11:54:43,634 DEBUG pylorax.ltmpl:     File "/usr/lib/python3.6/site-packages/pylorax/ltmpl.py", line 515, in runcmd
2017-09-19 11:54:43,634 DEBUG pylorax.ltmpl:       stdout = runcmd_output(cmd)
2017-09-19 11:54:43,634 DEBUG pylorax.ltmpl:     File "/usr/lib/python3.6/site-packages/pylorax/executils.py", line 347, in runcmd_output
2017-09-19 11:54:43,634 DEBUG pylorax.ltmpl:       return execWithCapture(cmd[0], cmd[1:], **kwargs)
2017-09-19 11:54:43,634 DEBUG pylorax.ltmpl:     File "/usr/lib/python3.6/site-packages/pylorax/executils.py", line 249, in execWithCapture
2017-09-19 11:54:43,635 DEBUG pylorax.ltmpl:       reset_handlers=reset_handlers, reset_lang=reset_lang)[1]
2017-09-19 11:54:43,635 DEBUG pylorax.ltmpl:     File "/usr/lib/python3.6/site-packages/pylorax/executils.py", line 201, in _run_program
2017-09-19 11:54:43,635 DEBUG pylorax.ltmpl:       raise subprocess.CalledProcessError(proc.returncode, argv, output)
2017-09-19 11:54:43,635 DEBUG pylorax.ltmpl:   subprocess.CalledProcessError: Command '['chroot', '/var/tmp/lorax.57gx60vw/installtree', '/usr/bin/rpm', '-qa', '--pipe', 'tee /root/lorax-packages.log']' returned non-zero exit status 1.