Add plugin capabilities for tls storage.

To use a plugged in storage, specify "storage storage_name" in the tls block of the Caddyfile, by default, file storage will be used

No need to check if SiteExists if the config is not managed or the name
does not even qualify.

Proxy: Set MaxIdleConnsPerHost to -1 to prevent Idle Conns

Proxy: Instead of setting DisableKeepAlives, set MaxIdleConnsPerHost to -1 to prevent net/http from pooling the connections. DisableKeepAlives causes net/http to send a Connection: Closed header which is bad. Fixes #1056

capture request body normally

fix issue #1015
Signed-off-by: Tw <tw19881113@gmail.com>

Signed-off-by: Tw <tw19881113@gmail.com>

Signed-off-by: Tw <tw19881113@gmail.com>

Add error parameter to storage.SiteExists()

Implement missing bits for an external servertype

Make ServerListeners public and add two helper methods to get access
to the address they listen on. This is useful for tests (among other
things)

Also make DefaultConfigFile a var so it can be overridden by server
types.

Fix for invalid environment variable names used on windows that start…

Fix for invalid environment variable names used on windows that start with an equals symbol. Even though this contradicts the Microsoft docs.

Fixes https://forum.caddyserver.com/t/basic-caddy-installation-failing-on-automatic-https/472?u=matt

* * Added support for environment variables to 'templates' module.

* Fixed flaw in test caused by environment variable ordering during testing on CI.

* Updated some local variables to camel-case.

* Reverted changes to replacer as environment variables are processed elsewhere.

* Removed PrintEnv functionality in favour of documenting using template range.

Fix error which lead to skipping tests in 'errors.TestErrorsParse'

Check for duplicate status code entries in 'errors' directive

Add support for default (wildcard) error page

Now logging the request body

Also don't bother showing stdout output in same situation

Need to add the name to namesObtaining each time we use the ACME client.