add docker machine support

[chonton]

This pull request replaces #437.

Add a configuration section <machine> which configures use of docker-machine. The precedence order of configuration is

1. dockerHost / certPath
2. <machine>
3. environment variables
4. fallbacks (unix:///var/run/docker.sock / ~/.docker/)

<machine> has three sub-elements:

• name - the name of the docker-machine
• autoCreate - create the docker-machine if not present
• creatOptions - the options used when creating a docker-machine

To use the <machine> element, docker-machine must be installed on the build host.
Before querying docker-machine for daemon values, the docker-machine will be started if necessary.

[rhuss]

Thanks again ;) Just about to integrate it into the code base (already rebased it), but I have still some questions, though

[rhuss]

Why is this change important ?

[chonton]

Not an important change. Aligned with latest recommended practice.

Chas

On Jun 26, 2016, at 6:29 PM, Roland Huß notifications@github.com wrote:

In src/main/java/io/fabric8/maven/docker/AbstractDockerMojo.java:

@@ -67,9 +68,13 @@
protected Settings settings;

 // Current maven project

• @parameter(defaultValue= "${session}", readonly = true)
• @parameter(property= "session")
  Why is this change important ?

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[rhuss]

ok, looks cleaner. will probably align the other usages, too.

[rhuss]

I'm nearly finished with including your patch and push it soon to branch integration. There will probably be a release today.

'hope my changes are ok for you (tuned a bit documentation, logging, class names ...)

[chonton]

Any change ok by me. Thanks for your dedication in supporting this plugin.

Chas

On Jun 26, 2016, at 9:14 PM, Roland Huß notifications@github.com wrote:

I'm nearly finished with including your patch and push it soon to branch integration. There will probably be a release today.

'hope my changes are ok for you (tuned a bit documentation, logging, class names ...)

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[rhuss]

I thank you for the contribution, its really awesome to have docker machine support now, which makes automation even easier. ;-)

[rhuss]

As it is now in integration I'm closing this PR. For unit tests please open a new one.

thanks ...