yaml: drop execute permissions from yaml files

Functionally this doesn't change anything but executable data files
would seem to be in conflict with typical idioms.

Change-Id: I5eddfd8a8be3d1b9eb53062fb60e46b845008fd9
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/scripts/entity-example.yaml b/scripts/entity-example.yaml
old mode 100755
new mode 100644
diff --git a/scripts/inventory-sensor-example.yaml b/scripts/inventory-sensor-example.yaml
old mode 100755
new mode 100644
diff --git a/scripts/sensor-example.yaml b/scripts/sensor-example.yaml
old mode 100755
new mode 100644