Add Beta support for egress/direction to google_compute_firewall.

[rileykarson]

• Add support for the Beta fields direction, destination_ranges to google_compute_firewall

Neither is updateable by the API yet.

direction always has a value in the API even when a null is sent; we need to conditionally read it as a result. This contrasts ip_version in #250, #265, which only has one when set explicitly.

Fixes #283.
Relates to #93.

[rosbo]

Update the documentation for this feature

[rileykarson]

Done.

[rosbo]

make testacc TESTARGS="-run TestAccComputeFirewall_" TEST="./google"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./google -v -run TestAccComputeFirewall_ -timeout 120m
=== RUN TestAccComputeFirewall_importBasic
--- PASS: TestAccComputeFirewall_importBasic (67.91s)
=== RUN TestAccComputeFirewall_basic
--- PASS: TestAccComputeFirewall_basic (66.95s)
=== RUN TestAccComputeFirewall_update
--- PASS: TestAccComputeFirewall_update (74.69s)
=== RUN TestAccComputeFirewall_noSource
--- PASS: TestAccComputeFirewall_noSource (62.85s)
=== RUN TestAccComputeFirewall_denied
--- PASS: TestAccComputeFirewall_denied (64.61s)
=== RUN TestAccComputeFirewall_egress
--- PASS: TestAccComputeFirewall_egress (64.17s)
PASS
ok github.com/terraform-providers/terraform-provider-google/google 401.311s

[ghost]

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