encode test ids as constants for easy replacement

[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