UB-1977 exclude the warning messages in multipath output

[27149chen]

The multipath output might print some warning messages if some devices are faulty, it has impact on the function isDeviceFaulty. I have no time to improve this fucntion, I will exclude these messages in 2.1 release.

Here is an example output:

Apr 04 16:13:40 | sde: couldn't get target port group
Apr 04 16:13:40 | sdd: couldn't get target port group
mpathj (3600507680c8701159800000000001af4) dm-17 IBM     ,2145            
size=1.0G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=0 status=active
| `- 39:0:0:1 sde 8:64 failed faulty running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 40:0:0:1 sdd 8:48 failed faulty running
mpathi (3600507680c8701159800000000001af3) dm-14 IBM     ,2145            
size=20G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 40:0:0:0 sdb 8:16 active ready running
`-+- policy='service-time 0' prio=10 status=enabled
  `- 39:0:0:0 sdc 8:32 active ready running

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This change is 

[coveralls]

Coverage increased (+0.2%) to 59.359% when pulling 527910e on feature/UB-1977_warning_messages_in_multipath_output into 3f22f0e on dev.

[shay-berman]

Must say that I don't like the specific error message catch here, because the error message can change and maybe other errors could happened as well. So i think that we should have more flexible scan that search for specific things and less sensitive to noise in the output. (Maybe open a ticket in jira to remember that this should be improved).

but anyway, since its the last minute of the release, and if its blocking then go a head and merge (make sure it pass staging).

Reviewable status: 0 of 3 files reviewed, all discussions resolved (waiting on @shay-berman)

[27149chen]

I agree with you, in fact I find a more efficient way to parse the multipath output: to print the multipath result in json. Will do it later.

Reviewable status: 0 of 3 files reviewed, all discussions resolved (waiting on @27149chen)

[shay-berman]

+1