chore: Run shfmt on ip fixture (#1274)

Follow up to #1090

Author: yedayak

test/fixtures/shared/bin/ip

@@ -3,18 +3,18 @@
 # Dummy "ip addr show" and "ip link show up" emulator
 
 for arg in "$@"; do
-case "$arg" in
-link)
-cat <<EOF
+    case "$arg" in
+        link)
+            cat <<EOF
 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default 
     link/ether 33:33:33:33:33:33 brd ff:ff:ff:ff:ff:ff link-netnsid 0
 EOF
-exit 0
-  ;;
-addr)
-cat <<EOF
+            exit 0
+            ;;
+        addr)
+            cat <<EOF
 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
     inet 127.0.0.1/8 scope host lo
@@ -28,9 +28,9 @@ cat <<EOF
     inet6 fe80::000:0000:0000:0000/64 scope link 
        valid_lft forever preferred_lft forever
 EOF
-exit 0
-  ;;
-esac
+            exit 0
+            ;;
+    esac
 done
 
 exit 1