Use a mixin module instead of inheritance

[m0dular]

Use a mixin module instead of inheritance

Prior to this commit, the module used a Puppet class to instantiate a
base provider for the other providers to inherit.  However, this caused
issues when using the 'require' metaparameter in manifests, because
Puppet may not have autoloaded the base type yet.  It was also overly
complicated.

This commit moves this functionality to a shared module which uses
constants and instance methods, which is a simpler design.  This removes
the need for the Puppet wrapper class, and the user does not need to
require anything to use the types.

[puppet-community-rangefinder]

influxdb::from_toml is a function

that may have no external impact to Forge modules.

influxdb::retrieve_token is a function

that may have no external impact to Forge modules.

influxdb::to_toml is a function

that may have no external impact to Forge modules.

This module is declared in 0 of 578 indexed public Puppetfiles.

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Exact matches are those that we can positively identify via namespace and the declaring modules' metadata. Non-namespaced items, such as Puppet 3.x functions, will always be reported as near matches only.

[MartyEwings]

Looks good to me with the exception of the commented out code parts.

I also updated my original Pull for testing to add in the missing fixture, I'm not sure if you have to replay that commit over the top of this or not

Done

[m0dular]

Cancelled the tests since it was just a squash.