Increase code coverage by running TF acceptance tests

This has required a number of changes, first of all to .travis.yml
to allow the TF acceptance tests to run:
   1. To avoid the need to build libvirt, we've added the Ubuntu
      "cloud-archive:mitaka" repo which contains more recent versions
      of libvirt than those that ship with 14.04.  This also cuts
      a couple of minutes off the travis run-time.
   2. We need to define and start a default storage pool, since one
      doesn't exist by default on 14.04.
   3. We need to add the travis user to the libvirtd group, and
      then run both tests with "sg" to set the libvirtd group without
      requiring a log-out/log-in
   4. We need to set a couple of global environment variables for
      the travis run:
      - TF_ACC to true to ensure that TF acceptance tests are run
      - LIBVIRT_DEFAULT_URI needs to be set, we set it to qemu://system.
      - We've added a new environment variable that can be used to
        set the domain type for test purposes.  We need to set the
        domain type to "qemu" for travis CI.  "test" doesn't implement
        all of the libvirt functions that are used, and "kvm" isn't
        yet available in travis.
   5. We have to add "-v" to the test and goveralls command to ensure
      that TF acceptance tests are run.

In addition, we had to make the following change to
resource_libvirt_domain_test.go
   - The "br0" bridge doesn't exist by default, so instead we use
     the default network in resource_libvirt_domain_test.go

With these changes the test coverage goes up to 44% as measured by
goveralls.  Because we're using qemu emulation, the tests take about
2 mins to run on travis.

We might not need to run both the tests and goveralls; one might do.

1 files changed, 6 insertions, 1 deletions

diff --git a/libvirt/domain_def.go b/libvirt/domain_def.go
index 3920c979..f26b549c 100644
--- a/libvirt/domain_def.go
+++ b/libvirt/domain_def.go
@@ -2,6 +2,7 @@ package libvirt
 
 import (
 	"encoding/xml"
+	"os"
 )
 
 type defDomain struct {
@@ -115,7 +116,11 @@ type defConsole struct {
 func newDomainDef() defDomain {
 	// libvirt domain definition
 	domainDef := defDomain{}
-	domainDef.Type = "kvm"
+	if v := os.Getenv("TERRAFORM_LIBVIRT_TEST_DOMAIN_TYPE"); v != "" {
+		domainDef.Type = v
+	} else {
+		domainDef.Type = "kvm"
+	}
 	domainDef.Xmlns = ""
 
 	domainDef.Os = defOs{}