set default start / stop timeout to 120 seconds (systemd)

[jsirianni]

Description of Changes

Resolves #258

By setting TimeoutSec to two minutes, systemd will give stanza up to 120 seconds to start or stop. The value of 0 allows stanza to hang forever if there is an issue starting or stopping. This prevent servers from shutting down.

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Add a changelog entry (for non-trivial bug fixes / features)
• CI passes

[djaglowski]

Log Files	Logs / Second	CPU Avg (%)	CPU Avg Δ (%)	Memory Avg (MB)	Memory Avg Δ (MB)
1	1000	1.3965454	-0.13805914	128.51495	-5.4846497
1	5000	5.2417145	+0.24169064	139.05563	+0.76805115
1	10000	10.069177	-0.43101978	147.19208	+1.8638153
1	50000	53.00142	+2.7766418	175.86746	-2.9994507
1	100000	98.59211	+4.2793655	227.31493	-3.555893
10	100	2.0345192	+0.103456855	131.01697	-1.5025635
10	500	5.7933455	-0.18953323	140.02762	-1.8997803
10	1000	11.258859	+0.4312353	147.81358	+1.2592926
10	5000	51.93199	-0.9474907	179.96956	+0.10089111
10	10000	109.083496	-0.8758545	232.62662	+0.9439697

[codecov]

Codecov Report

Merging #402 (b02a684) into master (47e0a8b) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
- Coverage   73.25%   73.23%   -0.01%     
==========================================
  Files         124      124              
  Lines        7999     7999              
==========================================
- Hits         5859     5858       -1     
- Misses       1639     1640       +1     
  Partials      501      501              

Impacted Files	Coverage Δ
operator/builtin/input/file/file.go	79.06% <0.00%> (-1.57%)	⬇️
operator/builtin/output/forward/forward.go	64.20% <0.00%> (+2.47%)	⬆️

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