build: Use POSIX sh for shell scripts

The scripts didn't really use any bash specific features. Convert
them to POSIX shell scripts, so that the plugins can be built without
requiring bash.

Signed-off-by: Tom Wieczorek <twieczorek@mirantis.com>

Author: twz123

build_linux.sh

@@ -1,8 +1,8 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -e
 cd "$(dirname "$0")"
 
-if [ "$(uname)" == "Darwin" ]; then
+if [ "$(uname)" = "Darwin" ]; then
 	export GOOS="${GOOS:-linux}"
 fi
 

build_windows.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -e
 cd "$(dirname "$0")"
 

scripts/release.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -xe
 
 SRC_DIR="${SRC_DIR:-$PWD}"

test_linux.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 #
 # Run CNI plugin tests.
 # 
@@ -10,12 +10,12 @@ set -e
 cd "$(dirname "$0")"
 
 # Build all plugins before testing
-source ./build_linux.sh
+. ./build_linux.sh
 
 echo "Running tests"
 
-function testrun {
-    sudo -E bash -c "umask 0; PATH=${GOPATH}/bin:$(pwd)/bin:${PATH} go test -race $@"
+testrun() {
+    sudo -E sh -c "umask 0; PATH=${GOPATH}/bin:$(pwd)/bin:${PATH} go test -race $*"
 }
 
 COVERALLS=${COVERALLS:-""}

test_windows.sh

@@ -1,11 +1,11 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 #
 # Run CNI plugin tests.
 #
 set -e
 cd "$(dirname "$0")"
 
-source ./build_windows.sh
+. ./build_windows.sh
 
 echo "Running tests"