Silent capsh error output

[casperklein]

Signed-off-by: Casper casperklein@users.noreply.github.com

Description

This fixes a little "regression" introduced with #1086.

Before the mentioned PR, there was no output because grep -q was used.

Now if a capability is not available, something like this is printed:

cap[cap_net_admin] not permitted

Motivation and Context

Restore old behaviour.

How Has This Been Tested?

Before:

# /sbin/capsh --has-p=cap_net_admin && CAP_STR+=',CAP_NET_ADMIN' || DHCP_READY='false'
cap[cap_net_admin] not permitted

After (no output):

# /sbin/capsh --has-p=cap_net_admin 2>/dev/null && CAP_STR+=',CAP_NET_ADMIN' || DHCP_READY='false'

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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