agent: Update version to 1.0.3

Signed-off-by: Edileuton Henrique de Oliveira <eho09@c3sl.ufpr.br>

agent/configure.ac

 AC_PREREQ([2.65])
-AC_INIT([datasid-agent], [1.0.2], [datasid@c3sl.ufpr.br])
+AC_INIT([datasid-agent], [1.0.3], [datasid@c3sl.ufpr.br])
 AC_CONFIG_SRCDIR([src/client.c])
 AC_CONFIG_HEADERS([config.h])
 AC_PREFIX_DEFAULT([/opt])