Alex Robinson 54dc6bb6c9 Improve the error handling when creating/delete GCE IPs in e2e tests. ...

Prior to this, test failures caused by errors in these helpers printed
out long exec.ExitErrors structs that didn't contain any useful info,
for example:
```
Expected error:
      <*exec.ExitError | 0xc20804e518>: {
          ProcessState: {
              pid: 22855,
              status: 256,
              rusage: {
                  Utime: {Sec: 0, Usec: 312000},
                  Stime: {Sec: 0, Usec: 96000},
                  Maxrss: 42912,
                  Ixrss: 0,
                  Idrss: 0,
                  Isrss: 0,
                  Minflt: 21667,
                  Majflt: 0,
                  Nswap: 0,
                  Inblock: 0,
                  Oublock: 40,
                  Msgsnd: 0,
                  Msgrcv: 0,
                  Nsignals: 0,
                  Nvcsw: 52,
                  Nivcsw: 34,
              },
          },
      }
      exit status 1
  not to have occurred
```

2015-10-15 17:57:46 +00:00

3.5 KiB

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