fx format
Dev
fix bug in the --ca-bundle param of passing -f to _readlink
When _readlink is called the -f param must not be passed. _readlink (with leading underscore) is a wrapper around readlink (without leading underscore). _readlink already passes -f to readlink, that's why it must not be passed to _readlink.
fix https://github.com/Neilpang/acme.sh/issues/1188#issuecomment-357684744
sync
Add InternetX autoDNS dns api support
Add namesilo.com dns api support
support both debian and redhat