fix: pytest not reproducible in RHEL8

[liangwen12year]

Previously when we run tests_integration_pytest.yml in RHEL 8, device
becoming unmanaged and NM ifup command failed to bring up the
connection when running pytest with initscripts, because network scripts
are deprecated in RHEL8 and they are no longer provided by default.

To fix that, install network-scripts package to utilize the legacy
ifup command.

Signed-off-by: Wen Liang liangwen12year@gmail.com

[coveralls]

Pull Request Test Coverage Report for Build 1049263781

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 40.085%

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Totals
Change from base Build 1048064622:	0.0%
Covered Lines:	1039
Relevant Lines:	2592

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1032223547

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.05%) to 40.054%

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Files with Coverage Reduction	New Missed Lines	%
/home/runner/work/network/network/module_utils/network_lsr/ethtool.py	2	93.55%
/home/runner/work/network/network/library/network_connections.py	3	21.58%

Totals
Change from base Build 1001068449:	-0.05%
Covered Lines:	1037
Relevant Lines:	2589

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💛 - Coveralls

[richm]

lgtm - test passes on centos-8 and rhel-9 (when run manually)

[richm]

[citest bad]

[richm]

[citest bad]