[Freeipa-devel] [PATCH 25] Improve error logging for Dogtag subsystem installation

[Christian Heimes]

In the case of a failed installation or uninstallation of a Dogtag
subsystem, the error output of pkispawn / pkidestroyed are now shown to
the user. It makes it more obvious what went wrong and makes it easier
to debug a problem.

The error handler also attempts to get the full name of the installation
/ uninstallation log file from stdout. pkispawn and pkidestroy print the
absolute name as 'Log file: /path/to/file.log'. The user no longer has
to guess the right log file.

Example:
  [1/8]: configuring KRA instance
Failed to configure KRA instance: Command ''/usr/sbin/pkispawn' '-s'
'KRA' '-f' '/tmp/tmp1UpbwF'' returned non-zero exit status 1
pkispawn    : ERROR    ....... PKI subsystem 'KRA' for instance
'pki-tomcat' already exists!
See the installation logs and the following files/directories for more
information:
  /var/log/pki/pki-tomcat
  /var/log/pki/pki-kra-spawn.20151201151735.log
  [error] RuntimeError: KRA configuration failed.

The patch also changes a couple of modules that were using
the CalledProcessError exception object from subprocess instead of
ipautil.
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