Go binding: add StopNetwork()

[gm42]

This PR contains the following notable changes:

1. make sure that database creation is happening only while network thread is running
2. panic if the call to fdb_run_network() fails, instead of logging an error only
3. StartNetwork(), already deprecated, effectively becomes a no-op
4. expose a new StopNetwork() method which allows to follow spec for issues like https://github.com/apple/foundationdb/issues/2978 and https://github.com/apple/foundationdb/issues/3015

Any advice for test coverage?

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[gm42]

Cc @vishesh @ajbeamon, as I saw you were involved in discussing #3015

[foundationdb-ci]

Result of foundationdb-pr-clang-ide on Linux CentOS 7

• Commit ID: 0f04b8d5d476d17047e448c2ad253eb5288cf08a
• Duration 0:48:54
• Result: :white_check_mark: SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

• Commit ID: 0f04b8d5d476d17047e448c2ad253eb5288cf08a
• Duration 1:04:48
• Result: :x: FAILED
• Error: Error while executing command: docker build --label "org.foundationdb.version=${FDB_VERSION}" --label "org.foundationdb.build_date=${BUILD_DATE}" --label "org.foundationdb.commit=${COMMIT_SHA}" --progress plain --build-arg FDB_VERSION="${FDB_VERSION}" --build-arg FDB_LIBRARY_VERSIONS="${FDB_VERSION}" --build-arg FDB_WEBSITE="${FDB_WEBSITE}" --tag foundationdb/ycsb:${FDB_VERSION}-${COMMIT_SHA}-debug --file Dockerfile.eks --target ycsb .. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)
• Cluster Test Logs zip file of the test logs (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-clang on Linux CentOS 7

• Commit ID: 0f04b8d5d476d17047e448c2ad253eb5288cf08a
• Duration 1:21:06
• Result: :white_check_mark: SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr on Linux CentOS 7

• Commit ID: 0f04b8d5d476d17047e448c2ad253eb5288cf08a
• Duration 1:24:27
• Result: :white_check_mark: SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)