r/elasticache_parameter_group: Allow removing parameters

[radeksimko]

Closes #116

=== RUN   TestAccAWSElasticacheParameterGroup_importBasic
--- PASS: TestAccAWSElasticacheParameterGroup_importBasic (14.88s)
=== RUN   TestAccAWSElasticacheParameterGroup_only
--- PASS: TestAccAWSElasticacheParameterGroup_only (18.41s)
=== RUN   TestAccAWSElasticacheSubnetGroup_importBasic
--- PASS: TestAccAWSElasticacheSubnetGroup_importBasic (18.67s)
=== RUN   TestAccAWSElasticacheParameterGroup_basic
--- PASS: TestAccAWSElasticacheParameterGroup_basic (18.89s)
=== RUN   TestAccAWSElasticacheReplicationGroup_clusteringAndCacheNodesCausesError
--- PASS: TestAccAWSElasticacheReplicationGroup_clusteringAndCacheNodesCausesError (11.01s)
=== RUN   TestAccAWSElasticacheSecurityGroup_basic
--- PASS: TestAccAWSElasticacheSecurityGroup_basic (14.38s)
=== RUN   TestAccAWSElasticacheParameterGroup_removeParam
--- PASS: TestAccAWSElasticacheParameterGroup_removeParam (36.25s)
=== RUN   TestAccAWSElasticacheSubnetGroup_basic
--- PASS: TestAccAWSElasticacheSubnetGroup_basic (11.61s)
=== RUN   TestAccAWSElasticacheSubnetGroup_update
--- PASS: TestAccAWSElasticacheSubnetGroup_update (20.03s)
=== RUN   TestAccAWSElasticacheCluster_basic
--- PASS: TestAccAWSElasticacheCluster_basic (475.80s)
=== RUN   TestAccAWSElasticacheCluster_importBasic
--- PASS: TestAccAWSElasticacheCluster_importBasic (501.54s)
=== RUN   TestAccAWSElasticacheCluster_vpc
--- PASS: TestAccAWSElasticacheCluster_vpc (815.85s)
=== RUN   TestAccAWSElasticacheCluster_multiAZInVpc
--- PASS: TestAccAWSElasticacheCluster_multiAZInVpc (846.11s)
=== RUN   TestAccAWSElasticacheReplicationGroup_updateMaintenanceWindow
--- PASS: TestAccAWSElasticacheReplicationGroup_updateMaintenanceWindow (899.87s)
=== RUN   TestAccAWSElasticacheReplicationGroup_vpc
--- PASS: TestAccAWSElasticacheReplicationGroup_vpc (900.68s)
=== RUN   TestAccAWSElasticacheReplicationGroup_importBasic
--- PASS: TestAccAWSElasticacheReplicationGroup_importBasic (954.23s)
=== RUN   TestAccAWSElasticacheReplicationGroup_basic
--- PASS: TestAccAWSElasticacheReplicationGroup_basic (962.40s)
=== RUN   TestAccAWSElasticacheCluster_decreasingCacheNodes
--- PASS: TestAccAWSElasticacheCluster_decreasingCacheNodes (983.90s)
=== RUN   TestAccAWSElasticacheReplicationGroup_updateDescription
--- PASS: TestAccAWSElasticacheReplicationGroup_updateDescription (1003.99s)
=== RUN   TestAccAWSElasticacheReplicationGroup_updateParameterGroup
--- PASS: TestAccAWSElasticacheReplicationGroup_updateParameterGroup (1005.43s)
=== RUN   TestAccAWSElasticacheReplicationGroup_enableSnapshotting
--- PASS: TestAccAWSElasticacheReplicationGroup_enableSnapshotting (1004.29s)
=== RUN   TestAccAWSElasticacheCluster_snapshotsWithUpdates
--- PASS: TestAccAWSElasticacheCluster_snapshotsWithUpdates (1078.01s)
=== RUN   TestAccAWSElasticacheReplicationGroup_nativeRedisCluster
--- PASS: TestAccAWSElasticacheReplicationGroup_nativeRedisCluster (1221.85s)
=== RUN   TestAccAWSElasticacheReplicationGroup_multiAzInVpc
--- PASS: TestAccAWSElasticacheReplicationGroup_multiAzInVpc (1327.93s)
=== RUN   TestAccAWSElasticacheReplicationGroup_redisClusterInVpc2
--- PASS: TestAccAWSElasticacheReplicationGroup_redisClusterInVpc2 (1358.07s)
=== RUN   TestAccAWSElasticacheReplicationGroup_updateNodeSize
--- PASS: TestAccAWSElasticacheReplicationGroup_updateNodeSize (1857.41s)

[catsby]

LGTM 👍

[ghost]

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