Fix read method + test/document import for google_compute_health_check

[rileykarson]

• Make google_compute_health_check refresh the HealthCheck blocks on Read.
• Test importing a google_compute_health_check with each block type
• Document importing a google_compute_health_check

Fixes #134.

[stack72]

this LGTM thanks for this @rileykarson :)

% make testacc TEST=./google TESTARGS='-run=TestAccComputeHealthCheck_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./google -v -run=TestAccComputeHealthCheck_ -timeout 120m
=== RUN   TestAccComputeHealthCheck_importBasicHttp
--- PASS: TestAccComputeHealthCheck_importBasicHttp (24.04s)
=== RUN   TestAccComputeHealthCheck_importBasicHttps
--- PASS: TestAccComputeHealthCheck_importBasicHttps (23.14s)
=== RUN   TestAccComputeHealthCheck_importBasicTcp
--- PASS: TestAccComputeHealthCheck_importBasicTcp (23.99s)
=== RUN   TestAccComputeHealthCheck_importBasicSsl
--- PASS: TestAccComputeHealthCheck_importBasicSsl (23.06s)
=== RUN   TestAccComputeHealthCheck_tcp
--- PASS: TestAccComputeHealthCheck_tcp (23.71s)
=== RUN   TestAccComputeHealthCheck_tcp_update
--- PASS: TestAccComputeHealthCheck_tcp_update (35.30s)
=== RUN   TestAccComputeHealthCheck_ssl
--- PASS: TestAccComputeHealthCheck_ssl (23.41s)
=== RUN   TestAccComputeHealthCheck_http
--- PASS: TestAccComputeHealthCheck_http (23.43s)
=== RUN   TestAccComputeHealthCheck_https
--- PASS: TestAccComputeHealthCheck_https (23.05s)
=== RUN   TestAccComputeHealthCheck_tcpAndSsl_shouldFail
--- PASS: TestAccComputeHealthCheck_tcpAndSsl_shouldFail (0.00s)
PASS
ok  	github.com/terraform-providers/terraform-provider-google/google	223.152s

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