typo, fix /etc/init.d/gitlab: line 38: PPID: readonly variable
Merge branch 'master' into 'master'

fix typo in  init/sysvinit/centos/gitlab-puma

fix gitlab start error:

/etc/init.d/gitlab: line 38: PPID: readonly variable

See merge request !29
Merge branch 'master' of github.com:gitlabhq/gitlab-recipes