Import test refactor for opsworks resources

[ryndaniels]

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Relates #8944

Release note for CHANGELOG:

NONE

Output from acceptance testing:

--- PASS: TestAccAWSOpsworksCustomLayer_basic (71.06s)
--- PASS: TestAccAWSOpsworksCustomLayer_noVPC (66.17s)

--- PASS: TestAccAWSOpsworksInstance_UpdateHostNameForceNew (118.36s)
--- PASS: TestAccAWSOpsworksInstance_basic (119.94s)

--- PASS: TestAccAWSOpsworksStack_noVpcBasic (43.89s)
--- PASS: TestAccAWSOpsworksStack_noVpcChangeServiceRoleForceNew (70.71s)
--- PASS: TestAccAWSOpsworksStack_vpc (108.51s)
--- PASS: TestAccAWSOpsworksStack_noVpcCreateTags (71.16s)
--- PASS: TestAccAWSOpsWorksStack_classicEndpoints (57.56s)

[bflad]

LGTM

--- PASS: TestAccAWSOpsworksStack_noVpcBasic (28.93s)
--- PASS: TestAccAWSOpsworksCustomLayer_basic (33.25s)
--- PASS: TestAccAWSOpsworksInstance_basic (35.50s)
--- PASS: TestAccAWSOpsWorksStack_classicEndpoints (36.69s)
--- PASS: TestAccAWSOpsworksInstance_UpdateHostNameForceNew (37.02s)
--- PASS: TestAccAWSOpsworksStack_vpc (39.96s)
--- PASS: TestAccAWSOpsworksStack_noVpcCreateTags (40.88s)
--- PASS: TestAccAWSOpsworksCustomLayer_noVPC (47.08s)
--- PASS: TestAccAWSOpsworksStack_noVpcChangeServiceRoleForceNew (49.39s)

[ghost]

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