bootstrap.sh: use sh to run bootstrap-minion.sh
bootstrap.sh: use sh to run bootstrap-minion.sh

The bootstrap-minion.sh file has permissions 755, but the pscp command that
copies it to the minions does not preserve these permissions.

Signed-off-by: Nathan Cutler <f9d8c66a4e898e67db786769b5b347b640e1a9a6@suse.com>

smithfarm/vanguard