[Webhob] Django models wiki updates

[Calin Dragomir <calinx.l.dragomir@linux.intel.com>]

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Hi everyone,

I've updated the info on the Wiki based on what we've discussed earlier.
The updates are:

* *task_type* has been replaced with a BooleanField called 
*task_executed* which will be True for Executed tasks and False for 
prebuilt. I know this is different from the UI, but having task_type in 
the DB with the value True / False was a bit confusing for the readers. 
If anyone has objections on this, I can change it back to its original 
state.
* *task_number* has been replaced by an Integer field called *order *.
* *py_sh* field has been renamed as *script_type* .
* *code* field has been replaced by two fields called *file_path* and 
*line_number* .
* *disk_io* has been made a decimal field.
* *task_id* has been added to the set.
* *sstate_result* field has replaced *task_history* and has the 4 
options we have considered. If the current key of the choices is to be 
changed to numbers please let me know and I'll modify it.

There are a couple of questions added at the end of the table, which 
should be answered.

Please review my changes here: 
https://wiki.yoctoproject.org/wiki/Django_models

Thank you,
Calin

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