Replace wait-for-it with pg_isready within setup_suite.sh (#879)

## Before

```
 # Wait for postgis
    wait-for-it -h ${G3WSUITE_POSTGRES_HOST:-postgis} -p ${G3WSUITE_POSTGRES_PORT:-5432} -t 60
```

## After

```
# Wait for postgis

until pg_isready -h ${G3WSUITE_POSTGRES_HOST:-postgis} -p ${G3WSUITE_POSTGRES_PORT:-5432}; do
  echo "wait 30s until is ready"
  sleep 30;
done
```

ci_scripts/setup_suite.sh

@@ -44,8 +44,11 @@ if [ ! -e ${SETUP_DONE_FILE} ]; then
     ls ${PROJECTS_DIR} || mkdir ${PROJECTS_DIR}
     ls ${DATASOURCE_PATH} || mkdir ${DATASOURCE_PATH}
 
-    wait-for-it -h ${G3WSUITE_POSTGRES_HOST:-postgis} -p ${G3WSUITE_POSTGRES_PORT:-5432} -t 60
-
+    until pg_isready -h ${G3WSUITE_POSTGRES_HOST:-postgis} -p ${G3WSUITE_POSTGRES_PORT:-5432}; do
+      echo "wait 30s until is ready"
+      sleep 30;
+    done
+
     pushd .
     cd ${DJANGO_DIRECTORY}/core/static
     rm -rf bower_components
@@ -81,7 +84,10 @@ if [ ! -e ${SETUP_DONE_FILE} ]; then
 else
     echo "Setup was already done, skipping ..."
     # Wait for postgis
-    wait-for-it -h ${G3WSUITE_POSTGRES_HOST:-postgis} -p ${G3WSUITE_POSTGRES_PORT:-5432} -t 60
+    until pg_isready -h ${G3WSUITE_POSTGRES_HOST:-postgis} -p ${G3WSUITE_POSTGRES_PORT:-5432}; do
+      echo "wait 30s until is ready"
+      sleep 30;
+    done
 
     # Restore on restart ln -s for bower_component
     cd ${DJANGO_DIRECTORY}/core/static