Deletes a procedure step check image record from the CMMS image table. 
This permanently removes the stored image and thumbnail byte data associated with the given image id; it does not delete the procedure step check the image was attached to.

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### Parameters
**chkImageId** `Integer`: Id of image to delete<br />
**userId** `Integer`:Id of the user executing the function<br />

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### Returns
**# of records modified** `Integer`<br />
**msg** `String` None if success<br />

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### Example
```python
# Remove an image that was mistakenly attached to a procedure step check
chkImageId = 8830
userId = system.kanoa.security.getIDPUserId({'userName': 'SYSTEM'})
recordsModified, msg = system.kanoa.cmms.deleteImage(chkImageId, userId)
print recordsModified, msg
```