Update sed command for getting vlan_id from cmdline: (#181)

## Description


This fixes an issue where "vlan_id" is a substring. For example: "thisisavlan_id=123". This example will be treated as if the vlan_id was not set at all.

## Why is this needed



Fixes: #180 

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

Author: mergify[bot]

files/dhcp.sh

@@ -11,7 +11,7 @@ run_dhcp_client() {
 	one_shot="$1"
 	al="eth*"
 
-	vlan_id=$(sed -n 's/.*vlan_id=\([0-9]*\).*/\1/p' /proc/cmdline)
+	vlan_id=$(sed -n 's/.* vlan_id=\([0-9]*\).*/\1/p' /proc/cmdline)
 	if [ -n "$vlan_id" ]; then
 		al="eth*.*"
 	fi