* Issue #12622: Fix creating Prefix using VLAN without site
* Issue #12622: Fix importing Prefix using VLAN without site
This commit also adds tests to verify the import changes implemented
in this commit.
* Issue #12622: Cleanup code to filter allowed VLANs on a prefix import
* Closes#12622: Switch to VLAN selector dialog when creating Prefix
* Clean up base modules
* Clean up forms modules
* Clean up templatetags modules
* Replace custom simplify_decimal filter with floatformat
* Misc cleanup
* Merge ReturnURLForm into ConfirmationForm
* Clean up import statements for utilities.forms
* Fix field class references in docs
* Move ASN to a separate module
* Move ASNField from dcim to ipam
* Introduce ASNRange model
* Add relationship from ASN to ASNRange
* Add an available-asns API endpoint
* Add RIR assignment for ASNRange
* Add standard tests
* Move child ASNs to a tabbed view
* Remove FK on ASN to ASNRange
* Add tests for provisioning available ASNs
* Add docs for ASNRange
* 7961 add csv bulk update
* temp checkin - blocked
* 7961 bugfix and cleanup
* 7961 change to id, add docs
* 7961 add tests cases
* 7961 fix does not exist validation error
* 7961 fix does not exist validation error
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 update tests
* 7961 make test cases more explicit
* 7961 make test cases more explicit
* 7961 make test cases more explicit
* 7961 make test cases more explicit
* 7961 make test cases more explicit
* 7961 make test cases more explicit
* 7961 make test cases more explicit
* 7961 optimize loading csv test data
* 7961 update tests remove redundant code
* 7961 avoid MPTT issue in test cases
