provider/alicloud: Fix vpc and vswitch bugs while creating vpc and vswitch

[xiaozhu36]

This PR fixed the vpc and vswitch bugs that there will raise error when creating multiple vpc or vswitch simultaneously, and the PR using retry to solve them.

The running results of vpc and vswitch testcase as follows:

TF_ACC=1 go test ./alicloud -v -run=TestAccAlicloudVpc -timeout 120m=== RUN TestAccAlicloudVpc_basic
--- PASS: TestAccAlicloudVpc_basic (20.17s)
=== RUN TestAccAlicloudVpc_update
--- PASS: TestAccAlicloudVpc_update (34.13s)
PASS
ok github.com/alibaba/terraform-provider/alicloud 54.323s

TF_ACC=1 go test ./alicloud -v -run=TestAccAlicloudVswitch -timeout 120m
=== RUN TestAccAlicloudVswitch_basic
--- PASS: TestAccAlicloudVswitch_basic (30.97s)
PASS
ok github.com/alibaba/terraform-provider/alicloud 30.982s

[stack72]

Hi @xiaozhu36

Thanks for this - LGTM!

% make testacc TEST=./builtin/providers/alicloud TESTARGS='-run=TestAccAlicloudVpc'                                                          ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/06/05 20:16:22 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/alicloud -v -run=TestAccAlicloudVpc -timeout 120m
=== RUN   TestAccAlicloudVpc_basic
--- PASS: TestAccAlicloudVpc_basic (65.57s)
=== RUN   TestAccAlicloudVpc_update
--- PASS: TestAccAlicloudVpc_update (107.86s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/alicloud	173.436s
[stacko@Pauls-MacBook-Pro:~/Code/go/src/github.com/hashicorp/terraform on xiaozhu36-vpc-vsw-bug]
% make testacc TEST=./builtin/providers/alicloud TESTARGS='-run=TestAccAlicloudVswitch'                                                      ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/06/05 20:21:50 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/alicloud -v -run=TestAccAlicloudVswitch -timeout 120m
=== RUN   TestAccAlicloudVswitch_basic
--- PASS: TestAccAlicloudVswitch_basic (100.71s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/alicloud	100.732s

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