Only pass in APIServerName flag is specified

[r2d4]

Otherwise, compatibility with old versions of localkube is broken in
all cases. APIServerName flag can still only be specified in v1.5.3 or
newer.

[RichWellum]

👍

[dims]

code change looks good 👍

[r2d4]

+ gsutil cp gs://minikube-builds/logs/index.html gs://minikube-builds/logs/1245/index.html
Traceback (most recent call last):
  File "/usr/bin/../lib/google-cloud-sdk/bin/bootstrapping/gsutil.py", line 12, in <module>
    import bootstrapping
  File "/usr/lib/google-cloud-sdk/bin/bootstrapping/bootstrapping.py", line 19, in <module>
    from googlecloudsdk.core import execution_utils
  File "/usr/lib/google-cloud-sdk/lib/googlecloudsdk/core/execution_utils.py", line 28, in <module>
    from googlecloudsdk.core import log
  File "/usr/lib/google-cloud-sdk/lib/googlecloudsdk/core/log.py", line 24, in <module>
    from googlecloudsdk.core import properties
  File "/usr/lib/google-cloud-sdk/lib/googlecloudsdk/core/properties.py", line 1288, in <module>
    VALUES = _Sections()
  File "/usr/lib/google-cloud-sdk/lib/googlecloudsdk/core/properties.py", line 238, in __init__
    self.proxy = _SectionProxy()
  File "/usr/lib/google-cloud-sdk/lib/googlecloudsdk/core/properties.py", line 964, in __init__
    valid_proxy_types = sorted(http_proxy_types.PROXY_TYPE_MAP.keys())
AttributeError: 'module' object has no attribute 'PROXY_TYPE_MAP'

gsutil is having an issue here, looking into it

[r2d4]

Above gsutil error is related to our jenkins that just got upgraded. Looking into it

[codecov-io]

Codecov Report

Merging #1245 into master will decrease coverage by 0.12%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1245      +/-   ##
==========================================
- Coverage   43.22%   43.09%   -0.13%     
==========================================
  Files          48       48              
  Lines        2214     2216       +2     
==========================================
- Hits          957      955       -2     
- Misses       1102     1104       +2     
- Partials      155      157       +2

Impacted Files	Coverage Δ
pkg/minikube/cluster/commands.go	65.47% <0%> (-1.6%)	❌
pkg/minikube/kubeconfig/config.go	55.38% <0%> (-3.08%)	❌

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[r2d4]

Fixes #1220