Clean up installation script.

install/slapos.sh

 #!/bin/bash
 
 
-wget --no-check-certificates https://lab.nexedi.cn/rafael/slapos.playbook/raw/master/install/function-common -O /tmp/function-common
+PLAYBOOK_REPOSITORY_URL=https://lab.nexedi.cn/rafael/slapos.playbook/repository/archive.tar.gz?ref=master
+PLAYBOOK_BASE_FOLDER=slapos.playbook.git
+PLAYBOOK_RELATIVE_URL=$PLAYBOOK_BASE_FOLDER/playbook/slapos
+PLAYBOOK_FILENAME=slapos.playbook.git.master.tar.gz
+
+wget --no-check-certificate https://lab.nexedi.cn/rafael/slapos.playbook/raw/master/install/function-common -O /tmp/function-common
 
 source /tmp/function-common
 
@@ -21,12 +26,12 @@ fi
 
 is_package_installed ansible || install_package ansible
 
-rm -rf /tmp/playbook.tar.gz /tmp/slapos.playbook.git
+rm -rf /tmp/$PLAYBOOK_FILENAME /tmp/$PLAYBOOK_BASE_FOLDER
 
-wget https://lab.nexedi.cn/rafael/slapos.playbook/repository/archive.tar.gz?ref=master -O /tmp/playbook.tar.gz
+wget $PLAYBOOK_REPOSITORY_URL -O /tmp/$PLAYBOOK_FILENAME
 
-cd /tmp && tar -xzvf playbook.tar.gz
+cd /tmp && tar -xzvf $PLAYBOOK_FILENAME
 
-cd /tmp/slapos.playbook.git/slapos
+cd /tmp/$PLAYBOOK_RELATIVE_URL
 
-ansible -c local all
+ansible-playbook site.yml -i hosts --connection=local