Set gpgcheck=0 for locally-built repos

This is needed for make iso to succeed with NO_SIGN=1 setting.

This doesn't compromise security, because:
1) These are local reports anyway,
2) They are additioanlly verified by update_repo when NO_SIGN is not set.

conf/qubes-x86_64.conf

@@ -30,14 +30,14 @@ cost=10
 name=Qubes Local Repository
 baseurl=file:///tmp/qubes-installer/yum/installer/
 enabled=1
-gpgcheck=1
+gpgcheck=0
 gpgkey=file:///tmp/qubes-installer/keys/qubes-release-1-signing-key.asc
 cost=1
 
 [qubes-dom0]
 name=Qubes Local Repository
 baseurl=file:///tmp/qubes-installer/yum/qubes-dom0/
-enabled=1
+enabled=0
 gpgcheck=1
 gpgkey=file:///tmp/qubes-installer/keys/qubes-release-1-signing-key.asc
 cost=1
@@ -45,7 +45,7 @@ cost=1
 [dom0-updates]
 name=Qubes Dom0 Updates Local Repository
 baseurl=file:///tmp/qubes-installer/yum/dom0-updates/
-enabled=1
+enabled=0
 gpgcheck=1
 gpgkey=file:///tmp/qubes-installer/keys/qubes-release-1-signing-key.asc
 cost=1