vpc network custom mtu support (#4126) (#461)

Signed-off-by: Modular Magician <magic-modules@google.com>

docs/resources/google_compute_network.md

@@ -102,6 +102,8 @@ Properties that can be accessed from the `google_compute_network` resource:
 
     * `peer_mtu`: Maximum Transmission Unit in bytes.
 
+  * `mtu`: Maximum Transmission Unit in bytes. The minimum value for this field is 1460 and the maximum value is 1500 bytes.
+
 
 ## GCP Permissions
 

docs/resources/google_compute_networks.md

@@ -49,6 +49,7 @@ See [google_compute_network.md](google_compute_network.md) for more detailed inf
   * `creation_timestamps`: an array of `google_compute_network` creation_timestamp
   * `routing_configs`: an array of `google_compute_network` routing_config
   * `peerings`: an array of `google_compute_network` peerings
+  * `mtus`: an array of `google_compute_network` mtu
 
 ## Filter Criteria
 This resource supports all of the above properties as filter criteria, which can be used

libraries/google_compute_network.rb

@@ -33,6 +33,7 @@ class ComputeNetwork < GcpResourceBase
   attr_reader :creation_timestamp
   attr_reader :routing_config
   attr_reader :peerings
+  attr_reader :mtu
 
   def initialize(params)
     super(params.merge({ use_http_transport: true }))
@@ -51,6 +52,7 @@ def parse
     @creation_timestamp = parse_time_string(@fetched['creationTimestamp'])
     @routing_config = GoogleInSpec::Compute::Property::NetworkRoutingConfig.new(@fetched['routingConfig'], to_s)
     @peerings = GoogleInSpec::Compute::Property::NetworkPeeringsArray.parse(@fetched['peerings'], to_s)
+    @mtu = @fetched['mtu']
   end
 
   # Handles parsing RFC3339 time string

libraries/google_compute_networks.rb

@@ -32,6 +32,7 @@ class ComputeNetworks < GcpResourceBase
   filter_table_config.add(:creation_timestamps, field: :creation_timestamp)
   filter_table_config.add(:routing_configs, field: :routing_config)
   filter_table_config.add(:peerings, field: :peerings)
+  filter_table_config.add(:mtus, field: :mtu)
 
   filter_table_config.connect(self, :table)
 
@@ -80,6 +81,7 @@ def transformers
       'creationTimestamp' => ->(obj) { return :creation_timestamp, parse_time_string(obj['creationTimestamp']) },
       'routingConfig' => ->(obj) { return :routing_config, GoogleInSpec::Compute::Property::NetworkRoutingConfig.new(obj['routingConfig'], to_s) },
       'peerings' => ->(obj) { return :peerings, GoogleInSpec::Compute::Property::NetworkPeeringsArray.parse(obj['peerings'], to_s) },
+      'mtu' => ->(obj) { return :mtu, obj['mtu'] },
     }
   end