Multiple dependencies to Fabric Samples

[mbrandenburger]

The current repo contains three references to the Fabric Samples repository.

• go.mod: which is via the sample of the asset-transfer-basic. It refers to commit 84f9ba1dc4ec.
• samples/deployment/test-network: which contains setup.sh, a script to clone fabric samples repo to use the test-network. It refers to commit 50b69f6
• integration/deployment_test.sh: which clones the latest version of fabric samples to package and install the asset-transfer-basic/chaincode-go during the integration test. It refers to the latest commit during test execution.

This inconsistency may render in potential issues when playing, building, and testing FPC. We may want to explore ways to keep these dependency in sync.