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Buildspec commands - view, edit, find (#313)

* adding 'buildtest buildspec' command for operations on buildspec files.
There are four subcommands 'find', 'view', 'edit', 'check'. The
find will retrieve search all yml files from available repos and present
them in table format. There will be a buildspec.cache file in $HOME/.buildtest
which is used to store buildspec metadata during the find process.
The 'view' and 'edit' command are used for viewing or editing a buildspec.
The check command is not implemented yet.

* Bug in BuildspecParser when passing invalid yaml file due to key error.
We now safely search keys using get method from dictionary.
The 'buildtest buildspec edit' will allow user to edit their file in
editor and after quiting file, buildtest will validate buildspec
using BuildspecParser. If there are any error's a message will
be printed to screen and user can press any key and it will open an
editor. This allows user interactive development of buildspec with
validation. Once validation succeeds, buildtest will terminate.
Print invalid buildspecs to current directory in file buildspec.error
which keeps track of buildspec and error message. This file could be
printed nicely going forward.
Remove 'buildtest buildspec check' command for now, we are already
checking buildspec during the initial find.
Now we can invoke BuildspecParser in try/except block to validate
a buildspec, if no exception is raised that means buildspec is valid
otherwise SystemExit or ValidationError will be raised.

* column align buildtest commands when running buildtest --help.

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