fix: Checks if netcat exists before running while loop with nc

The functional tests run an infinite loop as long as nc returns an error, which always is the case if nc is not doesn't exist.

Signed-off-by: joshjms <joshjms1607@gmail.com>

Author: joshjms

test

@@ -225,6 +225,11 @@ function functional_pass {
 		agent_pids="${agent_pids} $pid"
 	done
 
+	if ! command -v nc >/dev/null; then
+		echo "nc is not found"
+		exit 255
+	fi
+
 	for a in 1 2 3; do
 		echo "Waiting for 'etcd-agent' on ${a}9027..."
 		while ! nc -z localhost ${a}9027; do