Set exec permissions to opennaas bin folder content.

Fixes issue
http://jira.i2cat.net/browse/OPENNAAS-1132

Permissions are set as follow
-rwxr-xr-x 1 i2cat i2cat  9121 oct 11 12:04 admin
-rwxr-xr-x 1 i2cat i2cat  8567 oct 11 12:04 client
-rwxr-xr-x 1 i2cat i2cat  1607 oct 11 12:04 create
-rwxr-xr-x 1 i2cat i2cat 10305 oct 11 12:04 karaf
-rw-r--r-- 1 i2cat i2cat  8447 oct 11 12:04 opennaas.bat
-rwxr-xr-x 1 i2cat i2cat  9633 oct 11 12:04 opennaas.sh
-rwxr-xr-x 1 i2cat i2cat  8451 oct 11 12:04 shell
-rwxr-xr-x 1 i2cat i2cat  3193 oct 11 12:04 start
-rwxr-xr-x 1 i2cat i2cat  3157 oct 11 12:04 stop