Test if we have access to the logging path (baseDirectory/logs) before attempting to write to them. This allows us to shut down gracefully with an easily understandable error message.
Without doing this, the log4j2 will attempt to access the logPath when it first uses the logger in the call() function.
* Tidy up
* Add install-shell-extensions command
* Make cli tests use same version of picocli as everything else
* Remove initLogging from NodeStartup, it is ran earlier by CordaCLIWrapper
* Use picocli snapshot for testing
* Use RunLast() parser to invoke correct subcommands
* Deprecate old clear-network-map-cache parameter
* Restructure NodeStartup for commands
* Get rid of -c option since the flag method has been deprecated and that didn't exist in last release
* Update documentation
* Update backwards compatibility test
* Get all subcommands working
* Refactor sub commands into seperate classes
* Update docs and fix some tests
* Docs changes
* Fix merge conflicts with master
* Fix renamed parameters
* Fix test failure
* Fix compatibility tests
* Add missing compatibility test for blob inspector
* Remove blob inspector compatibility test as there are import conflicts
* Assorted doc fixes
* Addressing review comments
* More review comments
* Couple more bits
* Fix broken tests
* Fix compilation error
* More merge conflicts
* Make startup logging function a bit more sensible
* Fix broken shell extensions
* Make shell extensions work with subcommands
* Make sure parameters for deprecated options are carried through
* More review comments
* Adding some s's
* One last go
* Fix compilation error on Windows
* Revert logging changes
* Revert docs back to their original imperatively moody state
* Fix link in shell documentation
* The TypeSafe config parser wants extensions.sshd to be present in the config even though extensions is nullable
* Temp commit
* Make Standalone Shell use picocli
* Simplify gradle config for bootstrapper
* Fix logging dependency issues
* Revert "Temp commit"
This reverts commit f4efafcc9d.
* Fix quasarExcludeExpression
* Correct bootstrapper configuration
* Correct CRaSH capitalisation in docs
* Fix unit tests
* Fix help text typo
* Make logging level case insensitive
* Fix CRaSH capitalisation in help text
* Fix unit tests
