Run the command and raise exception on errors
If run quietly it will not print an error message via the
L{gbp.log} logging API.
Whether the command prints anything to stdout/stderr depends on
the I{capture_stderr}, I{capture_stdout} instance variables.
All errors will be reported as subclass of the
L{CommandExecFailed} exception including a non zero exit
status of the run command.
@param args: additional command line arguments
@type args: C{list} of C{strings}
@param quiet: don't log failed execution to stderr. Mostly useful during
unit testing
@type quiet: C{bool}
>>> Command("/bin/true")(["foo", "bar"])
>>> Command("/foo/bar")(quiet=True) # doctest: +IGNORE_EXCEPTION_DETAIL
Traceback (most recent call last):
...
gbp.command_wrappers.CommandExecFailed