Add lint for release/2.0

* Added lint check
Status Job ID Name Coverage
  Lint
failed #18071
lint:lint-php5.4

00:00:54

passed #18072
lint:lint-php5.6

00:00:26

passed #18073
lint:lint-php7.0

00:00:24

passed #18074
lint:lint-php7.1

00:00:26

passed #18075
lint:lint-php7.2

00:00:28

 
Name Stage Failure
failed
lint:lint-php5.4 Lint
Checking out 4b6cd639 as release/2.0...

Skipping Git submodules setup
$ bash ci/docker_install.sh > /dev/null
+ apt-get update -yqq
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/InRelease Unable to find expected entry 'main/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.
ERROR: Job failed: exit code 1