[WIP] Cosmos databases & collections

[katbyte]

cosmos:
top level (moved to separate pr #3442)

• mongo databases
• sql databases
• cassandra keyspaces
• tables

top level

• mongo collection
• sql container
• cassandra table

container/collections:

• [-] mongo collections (index reads are empty, shardKey and index TTL broken)
• [-] sql containers (all reads fail with an unmarshall error, no properties added yet)
• [-] cassandra tables

fixes #1671
fixes #548

[katbyte]

depends on Azure/azure-sdk-for-go#4453 to be merged and released

[katbyte]

SDK issues for mongo:

• the SDK doesn't correctly populate Indexes on a read, despite seeing the data go across the wire it's always empty. Create/Update is indexes.key.keys and get returns indexes.key.key.
• The SDK/API treat indexes.key.keys as a list when the API only accepts a single value?
• if ExpireAfterSeconds is set on anything other then a _ts index the API 404s
• ShardKey doesn't work, when supplied the exact values returned by the API for an existing collection the error The partition key component definition path ''$v'\\\\/akey\\\\/'$v'' could not be accepted, failed near position '0'. is received.
  get data:

		"shardKey": {
			"akey": "Hash"
		},

put data:

			"shardKey": {
				"akey": "Hash"
			}

[katbyte]

SDK Issues for SQL:
DB creates but theres a unmarshal error on gets:

* azurerm_cosmos_sql_container.test: Error making get request for Cosmos SQL Container seven-day-container (Account kt-cosmos-sql, Database seven-day-db): documentdb.DatabaseAccountsClient#GetSQLContainer: Failure responding to request: StatusCode=200 -- Original Error: Error occurred unmarshalling JSON - Error = 'json: cannot unmarshal object into Go struct field IndexingPolicy.excludedPaths of type string' JSON = '{"properties":{"id":"seven-day-container","indexingPolicy":{"indexingMode":"consistent","automatic":true,"includedPaths":[{"path":"/*","indexes":[{"kind":"Range","dataType":"Number","precision":-1},{"kind":"Range","dataType":"String","precision":-1}]}],"excludedPaths":[{"path":"/\"_etag\"/?"}]},"conflictResolutionPolicy":{"mode":"LastWriterWins","conflictResolutionPath":"/_ts","conflictResolutionProcedure":""},"_rid":"639ZAJUnyLc=","_ts":1555048744,"_self":"dbs/639ZAA==/colls/639ZAJUnyLc=/","_etag":"\"0000ec30-0000-0a00-0000-5cb029280000\"","_docs":"docs/","_sprocs":"sprocs/","_triggers":"triggers/","_udfs":"udfs/","_conflicts":"conflicts/"}}'

[katbyte]

cassandra:

all gets fail with:

--- FAIL: TestAccAzureRMCosmosCassandraTable_debug (6.41s)
    testing.go:538: Step 0 error: Error applying: 1 error occurred:
        	* azurerm_cosmos_cassandra_table.test: 1 error occurred:
        	* azurerm_cosmos_cassandra_table.test: Error checking for presence of creating Cosmos Cassandra Table littbobbytables (Account kt-cosmos-cassandra, Keyspace sevendaykeyspace): documentdb.DatabaseAccountsClient#GetCassandraTable: Failure responding to request: StatusCode=401 -- Original Error: autorest/azure: Service returned an error. Status=401 Code="Unauthorized" Message="Required Header authorization is missing. Ensure a valid Authorization token is passed.\r\nActivityId: cb279bd7-11e5-4bc1-8f33-1baacbd50784, Microsoft.Azure.Documents.Common/2.2.0.0"

[katbyte]

blocked on #3335

[katbyte]

Going to close this as the rest will be opened as separate PRs

[github-actions]

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