Add RELOAD-CONFIG external command
Add RELOAD-CONFIG external command

The module ws-arbiter allows to receive RESTART and RELOAD commands.
This patch is for calling 'reload-shinken' defined command.
Tested on my environment.

Aimage/shinken,titilambert/alignak,titilambert/alignak,rledisez/shinken,Aimage/shinken,peeyush-tm/shinken,rledisez/shinken,Alignak-monitoring/alignak,kaji-project/shinken,kaji-project/shinken,fpeyre/shinken,dfranco/shinken,Aimage/shinken,lets-software/shinken,geektophe/shinken,mohierf/shinken,staute/shinken_package,mohierf/shinken,KerkhoffTechnologies/shinken,ddurieux/alignak,staute/shinken_deb,geektophe/shinken,tal-nino/shinken,lets-software/shinken,geektophe/shinken,gst/alignak,claneys/shinken,claneys/shinken,dfranco/shinken,KerkhoffTechnologies/shinken,fpeyre/shinken,gst/alignak,rledisez/shinken,lets-software/shinken,rednach/krill,rledisez/shinken,rledisez/shinken,peeyush-tm/shinken,naparuba/shinken,kaji-project/shinken,claneys/shinken,fpeyre/shinken,Simage/shinken,ddurieux/alignak,Simage/shinken,dfranco/shinken,geektophe/shinken,claneys/shinken,titilambert/alignak,savoirfairelinux/shinken,tal-nino/shinken,rednach/krill,naparuba/shinken,staute/shinken_deb,rednach/krill,naparuba/shinken,claneys/shinken,kaji-project/shinken,gst/alignak,claneys/shinken,rednach/krill,kaji-project/shinken,mohierf/shinken,staute/shinken_package,dfranco/shinken,lets-software/shinken,rledisez/shinken,staute/shinken_package,savoirfairelinux/shinken,fpeyre/shinken,staute/shinken_package,geektophe/shinken,ddurieux/alignak,fpeyre/shinken,rednach/krill,ddurieux/alignak,savoirfairelinux/shinken,Alignak-monitoring/alignak,geektophe/shinken,staute/shinken_deb,fpeyre/shinken,dfranco/shinken,Simage/shinken,lets-software/shinken,Aimage/shinken,savoirfairelinux/shinken,staute/shinken_package,savoirfairelinux/shinken,KerkhoffTechnologies/shinken,KerkhoffTechnologies/shinken,KerkhoffTechnologies/shinken,Simage/shinken,tal-nino/shinken,rednach/krill,staute/shinken_deb,naparuba/shinken,ddurieux/alignak,naparuba/shinken,staute/shinken_deb,tal-nino/shinken,peeyush-tm/shinken,titilambert/alignak,KerkhoffTechnologies/shinken,peeyush-tm/shinken,staute/shinken_deb,tal-nino/shinken,mohierf/shinken,staute/shinken_package,mohierf/shinken,gst/alignak,Simage/shinken,kaji-project/shinken,peeyush-tm/shinken,dfranco/shinken,lets-software/shinken,kaji-project/shinken,Aimage/shinken,ddurieux/alignak,savoirfairelinux/shinken,tal-nino/shinken,naparuba/shinken,mohierf/shinken,Aimage/shinken,peeyush-tm/shinken,Simage/shinken