[java] update property name

[titusfortner]

One-line summary

Rename toggle property to be more descriptive

Description

To toggle off Sauce code, set sauce.disabled to "true" rather than using saucelabs to "false"

Types of Changes

• Refactor/improvements

Updates:

• Allow disabling with environment variable as well as system property
• Rename Examples from *Test.java to *Example.java
• Run Examples sequentially after Tests to keep system property from propagating to other tests

[diemol]

I see some tests failing.

[nadvolod]

@titusfortner do we need an acceptance test that validates that this behavior works as expected? I remember that you had concerns. I also see a bunch of //TODO in the ToggleLocalExample.java