Shellvars: exclude directories from /etc/sysconfig/* wildcard
Shellvars: exclude directories from /etc/sysconfig/* wildcard

This prevents a bug where Augeas maps a directory such as
/etc/sysconfig/network-scripts to a lens via a matching transform and fails
to save if the user edits /etc/sysconfig/network-scripts/ifcfg-eth0.

hercules-team/augeas-do-not-use,jjlin/augeas,raphink/augeas,kumy/augeas,jjlin/augeas,domcleal/augeas,mlichvar/augeas,jtopjian/augeas,hercules-team/augeas,kunkku/augeas,hercules-team/augeas,mchf/augeas,manandbytes/augeas,dafugg/augeas,ptoscano/augeas,dafugg/augeas,MikaelSmith/augeas,pevalme/augeas,kunkku/augeas,domcleal/augeas,GeoffWilliams/augeas,pevalme/augeas,mchf/augeas,manandbytes/augeas,pevalme/augeas,jasperla/augeas,GeoffWilliams/augeas,jjlin/augeas,hercules-team/augeas-do-not-use,lutter/augeas,lutter/augeas,lutter/augeas,kumy/augeas,kumy/augeas,raphink/augeas,kunkku/augeas,domcleal/augeas,ptoscano/augeas,mlichvar/augeas,hercules-team/augeas-do-not-use,kumy/augeas,mlichvar/augeas,MikaelSmith/augeas,dafugg/augeas,ptoscano/augeas,jtopjian/augeas,jasperla/augeas