EOSDriver.get_users() returns empty string for sshkeys

[bewing]

Setup

napalm-eos version

(Paste verbatim output from pip freeze | grep napalm-eos between quotes below)

napalm-eos==0.5.6

eOS version

(Paste verbatim output from show version | json between quotes below)

{u'architecture': u'i386',
 u'bootupTimestamp': 1496206084.68,
 u'hardwareRevision': u'02.02',
 u'internalBuildId': u'13357416-6616-4a73-b088-cfbfcedd7078',
 u'internalVersion': u'4.18.2F-2GB-4930939.4182F',
 u'isIntlVersion': False,
 u'memFree': 2299720,
 u'memTotal': 3963676,
 u'modelName': u'DCS-7150S-52-CL-R',
 u'serialNumber': u'JPE15083350',
 u'systemMacAddress': u'00:1c:73:b4:d1:bf',
 u'version': u'4.18.2F-2GB'}

What I would expect

In [11]: d.get_users()['admin']
Out[11]: {u'level': 15, u'password': u'', u'role': u'network-admin', u'sshkeys': []}

What I get

In [11]: d.get_users()['admin']
Out[11]: {u'level': 15, u'password': u'', u'role': u'network-admin', u'sshkeys': [u'']}

Will submit PR in napalm_eos to fix, and update unit test in napalm_base to enumerate sshkeys and confirm the strings are valid keys.