Make createItems more resilient to crash exceptions

The createItems function was updated to get around some problematic crash exceptions I ran into during updates.  The following is a summary of the changes:

* A Warnings counter per list was added to track warnings during the items linking phase.  

* A Warning Counter Summary dumped at the end.  The following is a sample output of the counter at the end:

    Successfully created:

    ...
    *   1 AAA
         **0 warnings**

    *   1 BBB
         **1 warnings**
    ...

* Checks where added to prevent run-time exceptions.  Instead, the exceptions are logged.  Some were harmless.

* The following is a sample generated warning:

    **APP-NAME: WARNING:  Invalid relationship(undefined reference list) [list: THE-LIST] [path: THE-PATH]**

* An internal writeLog function was created to centralize createItems logging.  Did this because I wanted to differentiate logging for different vhost all coming up in parallel.  As you can see in #4 above the keystone.get('name') property is prepended to the logs.


Feel free to tweak as you see fit.  It did solve my issues and provides better feedback!

Missing space in `relationship(undefined`