Cleanup loop devices after test failure

Cleans up loop devices if part of the test or mount process fails.

Also increases btrfs default file size to 650MB to accommodate
minimum btrfs size on ppc64le and s390x

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>

script/setup/install-protobuf

@@ -2,7 +2,7 @@
 #
 # Downloads and installs protobuf
 #
-set -eux -o pipefail
+set -eu -o pipefail
 
 PROTOBUF_VERSION=3.5.1
 GOARCH=$(go env GOARCH)

script/setup/install-runc

@@ -3,7 +3,7 @@
 # Builds and installs runc to /usr/local/go/bin based off
 # the commit defined in vendor.conf
 #
-set -eux -o pipefail
+set -eu -o pipefail
 
 RUNC_COMMIT=$(grep opencontainers/runc ${GOPATH}/src/github.com/containerd/containerd/vendor.conf | cut -d " " -f 2)