Add BGP related information on aws_vpn_connection

[nati]

In this commit, we add tunnel1_bgp_asn, tunnel1_bgp_holdtime,
tunnel2_bgp_asn and tunnel2_bgp_hold time for aws_vpn_connection.
These values are needed to automate dynamic bgp vpn configuraion for
multi cloud provider such as interconnecting GCP and AWS.

[stack72]

Hi @nati

Thanks for the work here - this LGTM

% make testacc TEST=./aws TESTARGS='-run=TestAccAWSVpnConnection_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSVpnConnection_ -timeout 120m
=== RUN   TestAccAWSVpnConnection_importBasic
--- PASS: TestAccAWSVpnConnection_importBasic (280.69s)
=== RUN   TestAccAWSVpnConnection_basic
--- PASS: TestAccAWSVpnConnection_basic (313.86s)
=== RUN   TestAccAWSVpnConnection_withoutStaticRoutes
--- PASS: TestAccAWSVpnConnection_withoutStaticRoutes (222.00s)
=== RUN   TestAccAWSVpnConnection_disappears
--- PASS: TestAccAWSVpnConnection_disappears (166.66s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	983.234s

Paul

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