fix: Linter fixes for plugins/inputs/[n-o]*

[zak-pawel]

Following findings were fixed:

plugins/inputs/nats/nats.go:44:2                                    revive       import-shadowing: The name 'url' shadows an import name
plugins/inputs/neptune_apex/neptune_apex.go:248:8                   revive       unexported-naming: the symbol TimeLayout is local, its name should start with a lowercase letter
plugins/inputs/net_response/net_response.go:123:4                   revive       unexported-naming: the symbol RegEx is local, its name should start with a lowercase letter
plugins/inputs/net_response/net_response.go:189:2                   revive       unexported-naming: the symbol RegEx is local, its name should start with a lowercase letter
plugins/inputs/net_response/net_response.go:19:2                    staticcheck  SA9004: only the first constant in this group has an explicit type
plugins/inputs/net_response/net_response.go:242:9                   revive       early-return: if c {...} else {... return } can be simplified to if !c { ... return } ...
plugins/inputs/nginx_plus_api/nginx_plus_api_metrics.go:52:2        revive       import-shadowing: The name 'url' shadows an import name
plugins/inputs/nginx_upstream_check/nginx_upstream_check.go:124:49  revive       import-shadowing: The name 'url' shadows an import name
plugins/inputs/nginx_upstream_check/nginx_upstream_check.go:190:51  revive       import-shadowing: The name 'url' shadows an import name
plugins/inputs/nsd/nsd.go:64:71                                     revive       unexported-naming: the symbol Server is local, its name should start with a lowercase letter
plugins/inputs/nsq_consumer/nsq_consumer_test.go:100:3              revive       deep-exit: calls to log.Fatalf only in main() or init() functions
plugins/inputs/nsq_consumer/nsq_consumer_test.go:142:3              revive       deep-exit: calls to log.Fatalf only in main() or init() functions
plugins/inputs/nsq_consumer/nsq_consumer_test.go:174:6              staticcheck  SA1006: printf-style function with dynamic format string and no further arguments should use print-style function instead
plugins/inputs/nsq_consumer/nsq_consumer_test.go:181:6              staticcheck  SA1006: printf-style function with dynamic format string and no further arguments should use print-style function instead
plugins/inputs/nsq_consumer/nsq_consumer_test.go:79:2               gosimple     S1000: should use for range instead of for { select {} }
plugins/inputs/nstat/nstat.go:141:11                                revive       superfluous-else: if block ends with a continue statement, so drop this else and outdent its block
plugins/inputs/nstat/nstat.go:179:12                                revive       superfluous-else: if block ends with a continue statement, so drop this else and outdent its block
plugins/inputs/ntpq/ntpq.go:53:14                                   gosimple     S1007: should use raw string (`...`) with regexp.Compile to avoid having to escape twice
plugins/inputs/opcua/opcua_client.go:245:3                          revive       unnecessary-stmt: omit unnecessary break at the end of case clause
plugins/inputs/opcua/opcua_client.go:252:3                          revive       unnecessary-stmt: omit unnecessary break at the end of case clause
plugins/inputs/opcua/opcua_client.go:387:4                          revive       unnecessary-stmt: omit unnecessary break at the end of case clause
plugins/inputs/openldap/openldap.go:119:10                          revive       early-return: if c {...} else {... return } can be simplified to if !c { ... return } ...
plugins/inputs/openweathermap/openweathermap.go:42:2                revive       confusing-naming: Field 'baseURL' differs only by capitalization to other field in the struct type OpenWeatherMap

[srebhan]

Very nice round @zak-pawel! Only one cosmetic comment.

[telegraf-tiger]

😄 This pull request doesn't change the Telegraf binary size

📦 Looks like new artifacts were built from this PR.

Expand this list to get them here! 🐯

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_armv7.tar.gz
armhf.deb	i386.rpm	freebsd_i386.tar.gz
i386.deb	ppc64le.rpm	linux_amd64.tar.gz
mips.deb	s390x.rpm	linux_arm64.tar.gz
mipsel.deb	x86_64.rpm	linux_armel.tar.gz
ppc64el.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

[srebhan]

Perfect. Thank you @zak-pawel!