Update to Varnish 4.1.8

[jdeathe]

Update to Varnish 4.1.8

[jdeathe]

RPM release: https://packagecloud.io/varnishcache/varnish41/packages/el/6/varnish-release-4.1-4.el6.noarch.rpm/download

Yum repository: https://packagecloud.io/install/repositories/varnishcache/varnish41/config_file.repo?os=centos&dist=6&source=script

Manual repository install:

&& { \
	echo '[varnishcache_varnish41]'; \
	echo 'name=varnishcache_varnish41'; \
	echo 'baseurl=https://packagecloud.io/varnishcache/varnish41/el/6/$basearch'; \
	echo 'repo_gpgcheck=1'; \
	echo 'gpgcheck=0'; \
	echo 'enabled=1'; \
	echo 'gpgkey=https://packagecloud.io/varnishcache/varnish41/gpgkey'; \
	echo 'sslverify=1'; \
	echo 'sslcacert=/etc/pki/tls/certs/ca-bundle.crt'; \
	echo 'metadata_expire=300'; \
	echo ''; \
	echo '[varnishcache_varnish41-source]'; \
	echo 'name=varnishcache_varnish41-source'; \
	echo 'baseurl=https://packagecloud.io/varnishcache/varnish41/el/6/SRPMS'; \
	echo 'repo_gpgcheck=1'; \
	echo 'gpgcheck=0'; \
	echo 'enabled=0'; \
	echo 'gpgkey=https://packagecloud.io/varnishcache/varnish41/gpgkey'; \
	echo 'sslverify=1'; \
	echo 'sslcacert=/etc/pki/tls/certs/ca-bundle.crt'; \
	echo 'metadata_expire=300'; \
} >> /etc/yum.repos.d/varnishcache_varnish41.repo