Stop and restart prosody when modules are updated to avoid undefined behavior

src/freedombone-app-xmpp

                 fi
                 tar -xzvf $prosody_modules_filename
                 if [ -d prosody-modules ]; then
+                    systemctl stop prosody
                     cp -r prosody-modules/* /var/lib/prosody/prosody-modules
                     chown -R prosody:prosody /var/lib/prosody/prosody-modules
+                    systemctl start prosody
                 fi
             fi
         fi
 
     # change to using pep rather than profile modules
     if grep '"profile"' /etc/prosody/prosody.cfg.lua; then
+        systemctl stop prosody
         sed -i 's|"profile"|"pep"|g' /etc/prosody/prosody.cfg.lua
+        systemctl start prosody
     fi
     if ! grep '"vcard"' /etc/prosody/prosody.cfg.lua; then
+        systemctl stop prosody
         sed -i '/"pep"/a "vcard";' /etc/prosody/prosody.cfg.lua
+        systemctl start prosody
     fi
 }