support compound sharding keys

[shortdudey123]

Copied from edelight/chef-mongodb#158

Hi,

We are trying to deploy a complete sharded environment using a compound shard key. We have modified the libraries/mongodb.rb to allow this:

sharded_collections.each do |name, key|
      cmd = BSON::OrderedHash.new
      cmd['shardcollection'] = name
      cmd['key'] = key # before {key => 1} 
      begin

and the sharding key is defined in role like this:

     "sharded_collections": {
        "db.col":{       
          "field1": 1,
          "field2": 1
        }
      }

so far we have only managed to get this error,

Error executing action `create` on resource 'ruby_block[config_sharding]'

trying to execute the line 311:

result = admin.command(cmd, :check_response => false)

[github-actions]

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