add missing src/ prefix from docker commands, fix TEST_SERVER host and port

TEST_SERVER was still set to the staging server used in the previous editions of the book

Author: Xronophobe

chapter_09_docker.asciidoc

@@ -900,7 +900,7 @@ Let's see what our FTs think about this Docker version of our site.
 [role="small-code"]
 [subs="specialcharacters,macros"]
 ----
-$ pass:quotes[*TEST_SERVER=localhost:8888 ./src/manage.py test functional_tests \
+$ pass:quotes[*TEST_SERVER=localhost:8888 ./src/manage.py test src/functional_tests \
     --failfast*]
 [...]
 selenium.common.exceptions.WebDriverException: Message: Reached error page:
@@ -1226,7 +1226,7 @@ Let's see what our functional tests say:
 [role="small-code"]
 [subs="specialcharacters,macros"]
 ----
-$ pass:quotes[*TEST_SERVER=superlists-staging.ottg.eu:8000 ./manage.py test functional_tests \
+$ pass:quotes[*TEST_SERVER=localhost:8888 ./src/manage.py test src/functional_tests \
     --failfast*]
 [...]
 E
@@ -1317,7 +1317,7 @@ If we try our FTs again, they all pass!
 [role="small-code"]
 [subs="specialcharacters,macros"]
 ----
-$ pass:quotes[*TEST_SERVER=superlists-staging.ottg.eu:8000 ./manage.py test functional_tests \
+$ pass:quotes[*TEST_SERVER=localhost:8888 ./src/manage.py test src/functional_tests \
     --failfast*]
 Found 3 test(s).
 Creating test database for alias 'default'...
@@ -1389,7 +1389,7 @@ And we check the FTs again.
 [role="small-code"]
 [subs="specialcharacters,macros"]
 ----
-$ pass:quotes[*TEST_SERVER=superlists-staging.ottg.eu:8000 ./manage.py test functional_tests \
+$ pass:quotes[*TEST_SERVER=localhost:8888 ./src/manage.py test src/functional_tests \
     --failfast*]
 Found 3 test(s).
 Creating test database for alias 'default'...