cmd/bosun: added setting for example expression in *.toml #2261
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Changes in this pull request:
-Added optional setting in *.toml file "ExampleExpression" which allows to setup default expression under "Expression" tab in web UI.
-fixed bug: after testing of empty expression other expressions can not be tested (button stops sending expressions to test)
-added error message if user tests empty expression
Why it is needed: currently default expression is defined in expr.ts file and works properly if opentsdb is configured. In other environments (where graphite configured for example) after opening of "Expression" tab user sees error message "expr: non existent function q" that confuses him a bit.