support empty lists for CBR rule contexts and zone addresses

[mtbrandy]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccIBMCbr'

=== RUN   TestAccIBMCbrRuleDataSourceBasic
--- PASS: TestAccIBMCbrRuleDataSourceBasic (14.90s)
=== RUN   TestAccIBMCbrRuleDataSourceAllArgs
--- PASS: TestAccIBMCbrRuleDataSourceAllArgs (11.43s)
=== RUN   TestAccIBMCbrZoneDataSourceBasic
--- PASS: TestAccIBMCbrZoneDataSourceBasic (11.58s)
=== RUN   TestAccIBMCbrZoneDataSourceAllArgs
--- PASS: TestAccIBMCbrZoneDataSourceAllArgs (10.80s)
=== RUN   TestAccIBMCbrRuleBasic
--- PASS: TestAccIBMCbrRuleBasic (8.89s)
=== RUN   TestAccIBMCbrRuleAllArgs
--- PASS: TestAccIBMCbrRuleAllArgs (19.86s)
=== RUN   TestAccIBMCbrZoneBasic
--- PASS: TestAccIBMCbrZoneBasic (9.38s)
=== RUN   TestAccIBMCbrZoneAllArgs
--- PASS: TestAccIBMCbrZoneAllArgs (19.46s)
PASS

[zhenwan]

It would be great if we could add examples to the following two files to demonstrate the new features:
website/docs/r/cbr_rule.html.markdown
website/docs/r/cbr_zone.html.markdown

[mtbrandy]

It would be great if we could add examples to the following two files to demonstrate the new features: website/docs/r/cbr_rule.html.markdown website/docs/r/cbr_zone.html.markdown

Creating rules with empty context lists / zones with empty address lists is a fairly specific use case (not allowing any access). I don't think it should be included in the basic examples at this time.