pmchart: record mode, keep "local:" arg for launched pmloggers
pmchart: record mode, keep "local:" arg for launched pmloggers

When pmchart "record mode" launches a pmlogger for host "local:",
don't resolve the argument to the local hostname because pmlogger
may not then be able to connect to the local PMCD if PMCD_LOCAL=1
is set in sysconfig. Pmlogger already correctly handles translation
of "local:" for the archive label.

Resolves regression reported in RHBZ#1824403

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp