bootstrap-install: Fix agent install failure on "Linux Educacional" system

The argument "-r" used by groupadd(8) and useradd(8) is not present on
passwd package installed on "Linux Educational" distribution. Also, this
argument is not necessary in any other linux distributions, so it is being
removed.

Signed-off-by: Diego Giovane Pasqualin <dgp06@c3sl.ufpr.br>

bootstraps/bootstrap-install

@@ -52,13 +52,13 @@ verify_md5(){
 # Begin of script
 
 # Creating seed_mec group and user
-if ! groupadd -fr seed_mec; then
+if ! groupadd -f seed_mec; then
     abort "falha ao criar o grupo seed_mec."
 fi
 
 # This is a temporary skel directory to avoid installing the default skel
 TMPSKEL=$(mktemp -d)
-if ! useradd -rm -g seed_mec -s /bin/bash -d "${SEED_MEC_HOME}" \
+if ! useradd -m -g seed_mec -s /bin/bash -d "${SEED_MEC_HOME}" \
              -k "${TMPSKEL}" seed_mec; then
     abort "falha ao criar o usuário seed_mec."
 fi