1. Ping to azure-devtools==0.4.3
2. Change the test invocation in build.sh to reduce output from
coverage.
3. Update coverage configuration
4. Fix missing storage test
1. Maximize the upload block size and single put size.
2. Remove the mitigation for storage python SDK issue #190.
3. Update blob storage upload/download tests
4. Add live only tests for large blob download
5. Add live test base class