tests: remove flakiness in test-nointerrupt.t
The problem was that the reaction to the signal was racing against
the completion of the command.
Since reaction to the signal is to print a line of warning,
we can fix this by waiting for that warning to appear before
allowing the command to complete.
pub type ExitCode = i32;
/// Successful exit
pub const OK: ExitCode = 0;
/// Generic abort
pub const ABORT: ExitCode = 255;
// Abort when there is a config related error
pub const CONFIG_ERROR_ABORT: ExitCode = 30;
// Abort when there is an error while parsing config
pub const CONFIG_PARSE_ERROR_ABORT: ExitCode = 10;
/// Generic something completed but did not succeed
pub const UNSUCCESSFUL: ExitCode = 1;
/// Command or feature not implemented by rhg
pub const UNIMPLEMENTED: ExitCode = 252;
/// The fallback path is not valid
pub const INVALID_FALLBACK: ExitCode = 253;