Make tools bash compatible

Change-Id: Iccccc91b0a44f92bcbb2442638a93e7624da112b

tools/cleanup-images

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # Move to top level directory
-REAL_PATH=$(python -c "import os,sys;print os.path.realpath('$0')")
+REAL_PATH=$(realpath $0)
 cd "$(dirname "$REAL_PATH")/.."
 
 . tools/validate-docker-execute.sh

tools/validate-all-dockerfiles.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
-REAL_PATH=$(python -c "import os,sys;print(os.path.realpath('$0'))")
+# Move to top level directory
+REAL_PATH=$(realpath $0)
 cd "$(dirname "$REAL_PATH")/.."
 
 RES=0

tools/validate-all-yaml.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
-REAL_PATH=$(python -c "import os,sys;print os.path.realpath('$0')")
+# Move to top level directory
+REAL_PATH=$(realpath $0)
 cd "$(dirname "$REAL_PATH")/.."
 
 find . -name '*.yaml' -o -name '*.yml' -print0 |

tools/validate-binary-build.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
-REAL_PATH=$(python -c "import os,sys;print(os.path.realpath('$0'))")
+# Move to top level directory
+REAL_PATH=$(realpath $0)
 cd "$(dirname "$REAL_PATH")/.."
 
 RES=0