Adding trivial fix for access update testcase

[shuklanirdesh82]

reverting the logging change added to reproduce #1371 and addition to that test steps are improved too.

1. Adding --rm flag while mounting volume so that containers is removed automatically
2. Test code cleanup while addressing Added WIP to Readme.md #1
3. Reverting extra logging change added as part of Add log to dump kv_str #1388

Testing done: Yes

GO15VENDOREXPERIMENT=1 go test -v -timeout 30m -tags runalways github.com/vmware/docker-volume-vsphere/tests/e2e -check.f "TestAccessUpdate"
=== RUN   Test
2017/06/17 00:34:13 Finding VM name from IP Address [10.20.104.40]
2017/06/17 00:34:14 Finding VM name from IP Address [10.20.104.40]
2017/06/17 00:34:15 Finding Datastores available on ESX
2017/06/17 00:34:15 START: VolumeAccessTestSuite.TestAccessUpdate
2017/06/17 00:34:15 Creating volume [vol_access_volume_16ddfwutxgjte@TestDatastore] on VM [10.20.104.40]
2017/06/17 00:34:16 Writing message_by_host1 to file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:21 Reading from file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:25 Writing message_by_host2 to file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:30 Reading from file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:34 Updating access to [read-only] for volume [vol_access_volume_16ddfwutxgjte@TestDatastore] 
2017/06/17 00:34:36 Writing message_by_host1 to file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:39 Writing message_by_host2 to file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:43 Updating access to [read-write] for volume [vol_access_volume_16ddfwutxgjte@TestDatastore] 
2017/06/17 00:34:45 Writing message_by_host1 to file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:50 Reading from file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:54 Writing message_by_host2 to file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:34:58 Reading from file test.txt on volume [vol_access_volume_16ddfwutxgjte@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:03 END: VolumeAccessTestSuite.TestAccessUpdate
2017/06/17 00:35:03 Destroying volume [vol_access_volume_16ddfwutxgjte@TestDatastore]
2017/06/17 00:35:05 START: VolumeAccessTestSuite.TestAccessUpdate_R_RW
2017/06/17 00:35:05 Creating volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] with options [ -o access=read-only] on VM [10.20.104.40]
2017/06/17 00:35:11 Writing message_by_host1 to file test.txt on volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:15 Writing message_by_host2 to file test.txt on volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:19 Updating access to [read-write] for volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] 
2017/06/17 00:35:21 Writing message_by_host1 to file test.txt on volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:25 Reading from file test.txt on volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:30 Writing message_by_host2 to file test.txt on volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:34 Reading from file test.txt on volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore] from VM[10.20.104.40]
2017/06/17 00:35:39 END: VolumeAccessTestSuite.TestAccessUpdate_R_RW
2017/06/17 00:35:39 Destroying volume [vol_access_volume_1l0kco5jhjsx3@TestDatastore]
OK: 2 passed
--- PASS: Test (87.86s)
PASS
ok  	github.com/vmware/docker-volume-vsphere/tests/e2e	87.861s

/CC @pdhamdhere

[pdhamdhere]

LGTM