macro(exe_running_docker_save): add better support for centos
macro(exe_running_docker_save): add better support for centos

dockerd and docker have "-current" suffix on centos and rhel. This
macro does not match causing false positives on multiple rules
using it

Signed-off-by: Radu Andries <8cd32adbfdfb986a6f0d684f7a16030a20d97029@sysdig.com>

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