Update oci-go-sdk to release version v5.15.0

Author: ccushing

go.mod

@@ -3,7 +3,7 @@ module github.com/terraform-providers/terraform-provider-oci
 require (
 	github.com/hashicorp/hcl v0.0.0-20180404174102-ef8a98b0bbce // indirect
 	github.com/hashicorp/terraform v0.12.4-0.20190628193153-a74738cd35fc
-	github.com/oracle/oci-go-sdk v5.14.0+incompatible
+	github.com/oracle/oci-go-sdk v5.15.0+incompatible
 	github.com/stretchr/objx v0.1.1 // indirect
 	github.com/stretchr/testify v1.3.0
 	gopkg.in/yaml.v2 v2.2.2

go.sum

@@ -272,6 +272,8 @@ github.com/oracle/oci-go-sdk v5.13.0+incompatible h1:CAs2Aq71RxYwDBT+L0z4cLmW20A
 github.com/oracle/oci-go-sdk v5.13.0+incompatible/go.mod h1:VQb79nF8Z2cwLkLS35ukwStZIg5F66tcBccjip/j888=
 github.com/oracle/oci-go-sdk v5.14.0+incompatible h1:RL/BN87saea2/iGFCT3jmr+IK420DFuSDQ233fdz6fM=
 github.com/oracle/oci-go-sdk v5.14.0+incompatible/go.mod h1:VQb79nF8Z2cwLkLS35ukwStZIg5F66tcBccjip/j888=
+github.com/oracle/oci-go-sdk v5.15.0+incompatible h1:rTlmaWEe255HczQJ2uOPM9xw3prU9jNk5GxPy+RFi3k=
+github.com/oracle/oci-go-sdk v5.15.0+incompatible/go.mod h1:VQb79nF8Z2cwLkLS35ukwStZIg5F66tcBccjip/j888=
 github.com/packer-community/winrmcp v0.0.0-20180102160824-81144009af58/go.mod h1:f6Izs6JvFTdnRbziASagjZ2vmf55NSIkC/weStxCHqk=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pkg/errors v0.0.0-20170505043639-c605e284fe17/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=