provider/azurerm: create common schema for location field, add diff suppress

[pmcatominey]

As suggested in #9208.

Touches a lot of resources though the diff is pretty small, can be broken up into smaller commits/PRs is preferred.

Ran the following tests which are passing (no output from TeamCity runner)

go test -c ./builtin/providers/azurerm -o ./builtin/providers/azurerm/test-azurerm
TestAccAzureRMClientConfig_basic
TestAccAzureRMAvailabilitySet_basic
TestAccAzureRMDnsAAAARecord_basic
TestAccAzureRMDnsARecord_basic
TestAccAzureRMCdnProfile_basic
TestAccAzureRMDnsCNameRecord_basic
TestAccAzureRMCdnEndpoint_basic
TestAccAzureRMDnsMxRecord_basic
TestAccAzureRMDnsNsRecord_basic
TestAccAzureRMDnsSrvRecord_basic
TestAccAzureRMDnsTxtRecord_basic
TestAccAzureRMDnsZone_basic
TestAccAzureRMKeyVault_basic
TestAccAzureRMLoadBalancerBackEndAddressPool_basic
TestAccAzureRMLoadBalancerNatPool_basic
TestAccAzureRMEventHubNamespace_basic
TestAccAzureRMLoadBalancerNatRule_basic
TestAccAzureRMEventHub_basic
TestAccAzureRMLoadBalancerProbe_basic
TestAccAzureRMLoadBalancer_basic
TestAccAzureRMLoadBalancerRule_basic
TestAccAzureRMLocalNetworkGateway_basic
TestAccAzureRMNetworkSecurityGroup_basic
TestAccAzureRMPublicIpStatic_basic
TestAccAzureRMNetworkInterface_basic
TestAccAzureRMNetworkSecurityRule_basic
TestAccAzureRMResourceGroup_basic
TestAccAzureRMPublicIpDynamic_basic
TestAccAzureRMRouteTable_basic
TestAccAzureRMSearchService_basic
TestAccAzureRMRoute_basic
TestAccAzureRMSqlDatabase_basic
TestAccAzureRMServiceBusNamespace_basic
TestAccAzureRMServiceBusSubscription_basic
TestAccAzureRMServiceBusTopic_basic
TestAccAzureRMSqlServer_basic
TestAccAzureRMSqlFirewallRule_basic
TestAccAzureRMStorageBlob_basic
TestAccAzureRMStorageAccount_basic
TestAccAzureRMStorageContainer_basic
TestAccAzureRMStorageQueue_basic
TestAccAzureRMStorageShare_basic
TestAccAzureRMStorageTable_basic
TestAccAzureRMSubnet_basic
TestAccAzureRMTrafficManagerEndpoint_basic
TestAccAzureRMVirtualNetwork_basic
TestAccAzureRMVirtualNetworkPeering_basic
TestAccAzureRMTemplateDeployment_basic
TestAccAzureRMVirtualMachineExtension_basic

[stack72]

LGTM! Thanks for the work here @pmcatominey :)

[ghost]

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