Proposal for improvements to Continuum distributed builds

[Jevica Arianne B. Zurbano]

In distributed builds, the <continuumServerUrl> in 
$buildagent_home/conf/continuum-buildagent.xml is used for determining 
where the buildagent should return the results to.

With the current setup, the <continuumServerUrl> needs to be manually 
configured especially if the the Continuum master runs on different host 
and port other than the default (localhost:8080). Another limitation is 
that only one Continuum instance can use a buildagent.

So, I propose to have the continuumServerUrl be configurable through the 
buildContext which is sent by the master to the build agent. With this, 
the <continuumServerUrl> in the continuum-buildagent.xml is still 
retained. So, if the <continuumServerUrl> is not set in the 
continuum-buildagent.xml, the continuumServerUrl from the buildContext 
is used.

In this way, a build agent can be used by multiple Continuum instances. 
And since the continuumServerUrl is in the buildContext, the result is 
guaranteed to be returned to the master who invoked the build.

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Thanks,

Jev