Remove "yum update" command from config-daemon Dockerfile

[ykulazhenkov]

Remove "yum update" command from Dockerfile.sriov-network-config-daemon.

For config-daemon, centos:stream8 is used as a base image.
This image is actively maintained and should include available security updates with minimal delay.

The reason for this change is that latest(current) version of centos:stream8 image has following problem:

sudo docker run -ti --rm quay.io/centos/centos:stream8
[root@08c3ef94d916 /]# yum update
CentOS Stream 8 - AppStream                                                                                                                                                    7.8 MB/s |  21 MB     00:02    
CentOS Stream 8 - BaseOS                                                                                                                                                       8.0 MB/s |  20 MB     00:02    
CentOS Stream 8 - Extras                                                                                                                                                        26 kB/s |  18 kB     00:00    
Error: 
 Problem: package centos-stream-repos-8-4.el8.noarch requires centos-gpg-keys = 1:8-4.el8, but none of the providers can be installed
  - cannot install both centos-gpg-keys-1:8-5.el8.noarch and centos-gpg-keys-1:8-4.el8.noarch
  - cannot install the best update candidate for package centos-stream-repos-8-4.el8.noarch
  - cannot install the best update candidate for package centos-gpg-keys-1:8-4.el8.noarch
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

So, this change is a workaround to fix the problem above, but this change can be safely persist while centos:stream8 image
is maintained and keep receiving updates.

[github-actions]

Thanks for your PR,
To run vendors CIs use one of:

• /test-all: To run all tests for all vendors.
• /test-e2e-all: To run all E2E tests for all vendors.
• /test-e2e-nvidia-all: To run all E2E tests for NVIDIA vendor.

To skip the vendors CIs use one of:

• /skip-all: To skip all tests for all vendors.
• /skip-e2e-all: To skip all E2E tests for all vendors.
• /skip-e2e-nvidia-all: To skip all E2E tests for NVIDIA vendor.
  Best regards.