I am using the yum module to lock the release version for a RHEL 7.6 machine to 7.7 version. However the yum --releasever option does not set the release version to 7.7. I am using Ansible 2.7.10 version.
Here is the discussion regarding the issue: 
https://access.redhat.com/discussions/4774501

ISSUE TYPE
Bug Report

COMPONENT NAME
yum --releasever

ANSIBLE VERSION
2.7.10 

STEPS TO REPRODUCE
name: installing updated packages
yum:
name: '*'
state: latest
releasever: '7.7'

ACTUAL RESULTS
Play runs successfully however it does not update the release version of the server
if not repoq:
            pkgs = []
            try:
                try:
                    pkgs = self.yum_base.returnPackagesByDep(req_spec) + \
                        self.yum_base.returnInstalledPackagesByDep(req_spec)
                except Exception as e:
                    
                    
                    
                    
                    
                    if 'repomd.xml signature could not be verified' in to_native(e):
                        self.module.run_command(self.yum_basecmd + ['makecache'])
                        pkgs = self.yum_base.returnPackagesByDep(req_spec) + \
                            self.yum_base.returnInstalledPackagesByDep(req_spec)
                    else:
                        raise