Some distros do not provide the sendsms/smssend script with the smstools package.
In this cases the script for sending SMS did not work. This commit adds a dedection
when smssend/sendsms are not available whether the spool directory at
/var/spool/sms/outgoing is available or not. When it is available, the SMS notification
plugin drops a file to this directory which should then be processed by smsd.
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