main/fail2ban: fix process name

Bring in upstream revert of the process name change that broke Nagios
monitioring plugins etc.

Change process name from f2b/server back to fail2ban-server

(cherry picked from commit 983380a0)
7 jobs for !9816 with v3.12-fail2ban-fix-procname in 9 minutes and 51 seconds (queued for 1 second)
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Status Job ID Name Coverage
  Lint
passed #155635
x86_64 docker-alpine
lint

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  Build
passed #155640
aarch64 ci-build docker-alpine
build-aarch64

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passed #155641
armv7 ci-build docker-alpine
build-armv7

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ppc64le ci-build docker-alpine
build-ppc64le

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s390x ci-build docker-alpine
build-s390x

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x86 ci-build docker-alpine
build-x86

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passed #155636
x86_64 ci-build docker-alpine
build-x86_64

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