Allow underscore in host name (#1086) #5103

Job	Run time
Unit Tests	2m 35s
Lint	4m 43s
Unit tests with race condition detection	2m 53s
Build Unsigned Snapshot	1m 56s
Performance Tests	4m 51s
Integration Tests (ubuntu, 22.04)	11m 30s
Integration Tests (redhatenterprise, 9)	9m 59s
Integration Tests - Official OSS Images (bookworm, stable, debian)	7m 18s
Integration Tests (alpine, 3.19)	7m 56s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	7m 39s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	7m 43s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	7m 14s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	7m 16s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	7m 3s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	7m 46s
Integration Tests - Official OSS Images (alpine, stable, alpine)	6m 59s
Load Tests	4m 56s
	1h 50m 17s

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