add the essential binary kbs and fix make test when image type is disk

[xiaoxi404]

Remember：when image type is disk，we need to add two kernel parameters.

An example shelter.conf:

image_type = "disk"
vmm = "qemu"

[qemu]
bin = "/usr/libexec/qemu-kvm"
mem = "4G"
cpus = "2"
firmware =""
kern_cmdline = "KBS_URL=http://192.168.10.51:8080 PASSPHRASE_PATH=default/shelter-demos/passphrase"
opts = ""

Make test success output as shown below:

[2024-10-21 18:28:14][INFO] Using Image ID: shelter-demos
Running as unit: shelter_shelter-demos.service
Verified OK
Signature verified successfully.