v2v: tests: Fix -i vmx test so it is more stable.

When running under valgrind, the process takes a fraction of a second
to start up, changing the "Opening the guest" timestamp, which broke
the test.

Fixes commit ca40078cdd.

v2v/test-v2v-i-vmx-1.expected

@@ -1,4 +1,4 @@
-[   0.0] Opening the source -i vmx test-v2v-i-vmx-1.vmx
+
 Source guest information (--print-source option):
 
     source name: BZ1308535_21disks

v2v/test-v2v-i-vmx-2.expected

@@ -1,4 +1,4 @@
-[   0.0] Opening the source -i vmx test-v2v-i-vmx-2.vmx
+
 Source guest information (--print-source option):
 
     source name: Fedora 20

v2v/test-v2v-i-vmx-3.expected

@@ -1,4 +1,4 @@
-[   0.0] Opening the source -i vmx test-v2v-i-vmx-3.vmx
+
 Source guest information (--print-source option):
 
     source name: RHEL 7.1 UEFI

v2v/test-v2v-i-vmx-4.expected

@@ -1,4 +1,4 @@
-[   0.0] Opening the source -i vmx test-v2v-i-vmx-4.vmx
+
 Source guest information (--print-source option):
 
     source name: Windows 7 x64

v2v/test-v2v-i-vmx.sh

@@ -37,6 +37,7 @@ for i in 1 2 3 4; do
     # Normalize the print-source output.
     mv test-v2v-i-vmx-$i.actual test-v2v-i-vmx-$i.actual.old
     sed \
+        -e "s,.*Opening the source.*,," \
         -e "s,$(pwd),," \
         < test-v2v-i-vmx-$i.actual.old > test-v2v-i-vmx-$i.actual
     rm test-v2v-i-vmx-$i.actual.old