Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
an individual test with a rune like this:
```
- OTTER_WDT_LOG=otter_webdriver_tests=trace CARGO_MANIFEST_DIR=~ian/Rustup/Game/server time target/debug/wdt-simple --geckodriver-args=
+ OTTER_TEST_LOG=otter_webdriver_tests=trace CARGO_MANIFEST_DIR=~ian/Rustup/Game/server time target/debug/wdt-simple --geckodriver-args=
```
(This rune has some example logging options in it, for you to change
builder
.filter_level(log::LevelFilter::Info)
- .parse_env("OTTER_WDT_LOG")
+ .parse_env("OTTER_TEST_LOG")
.init();
debug!("starting");