Adding functionality for running e2e tests in Jenkins X

[axsaucedo]

This PR is ready to be reviewed. The PR contains:

• Updates to jenkins-x file to run e2e files every time PR is landed
• Override in jenkins-x that avoids the tagged version being created
• Script to run e2e tests inside docker-enabled pod
• Updated core-builder:0.4 with capability to build Go Operator, Python & Java engine

[axsaucedo]

/ok-to-test

[axsaucedo]

/ok-to-test

[seldondev]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[axsaucedo]

This PR is ready to be reviewed. The PR contains:

• Updates to jenkins-x file to run e2e files every time PR is landed
• Override in jenkins-x that avoids the tagged version being created
• Script to run e2e tests inside docker-enabled pod
• Updated core-builder:0.4 with capability to build Go Operator, Python & Java engine

[axsaucedo]

/cc @cliveseldon

[axsaucedo]

/cc @gsunner

[axsaucedo]

/cc @ryandawsonuk

[axsaucedo]

/test integration

[seldondev]

@axsaucedo: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
lint	0930a01	link	/test lint
integration	0930a01	link	/test integration

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