Update azure dependencies to recent, stable version

[philwinder]

The dependencies listed in the go.mod are pointing to azure libraries that have interfaces that goofys won't work with.

This PR updates the code to use the correct interfaces (I defaulted to empty options, this may not be appropriate) and then I could update the library versions to the most recent.

This fixes #664 and similar build issues.

[dannycjones]

@philwinder do you have a peer that can review and run the tests for these changes? I think its a case of running CLOUD=azblob make run-tests with the correct credentials configured as well. I don't have access to an Azure account nor the context at the moment to review changes for Azure back-end.

run-tests.sh shows some environment variables that can be set to configure for Azure:

goofys/test/run-tests.sh

Lines 46 to 66 in c6e678c

	elif [ $CLOUD == "azblob" ]; then
	: ${AZURE_STORAGE_ACCOUNT:="devstoreaccount1"}
	: ${AZURE_STORAGE_KEY:="Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw=="}
	: ${ENDPOINT:="http://127.0.0.1:8080/${AZURE_STORAGE_ACCOUNT}/"}
	if [ ${AZURE_STORAGE_ACCOUNT} == "devstoreaccount1" ]; then
	if ! which azurite >/dev/null; then
	echo "Azurite missing, run:" >&1
	echo "npm install -g azurite" >&1
	exit 1
	fi
	rm -Rf /tmp/azblob
	mkdir -p /tmp/azblob
	PROXY_BIN="azurite-blob -l /tmp/azblob --blobPort 8080 -s"
	#PROXY_BIN="azurite-blob -l /tmp/azblob --blobPort 8080 -d /dev/stdout"
	fi
	export AZURE_STORAGE_ACCOUNT
	export AZURE_STORAGE_KEY
	export ENDPOINT

I'm hoping we can get this PR reviewed by a member of the community, then final review and merge from Ka-Hing, allowing users to build and install Goofys using go install.

[dannycjones]

Would it be possible for you to rebase to pick up the update to the fuse lib in 829d8e5?

Currently we see the following error when building, which seems related to the FUSE lib updated in that commit. When I rebase on top of 829d8e5, build is OK.

$ make build
go build -ldflags "-X main.Version=`git rev-parse HEAD`"
# github.com/kahing/goofys
github.com/jacobsa/fuse/internal/buffer.memclr: relocation target runtime.memclrNoHeapPointers not defined for ABI0 (but is defined for ABIInternal)
make: *** [Makefile:13: build] Error 2

[kahing]

closing via cc76eec