allow numbers and underscores in names

[leahmcguire]

Related issues
requirement was only so updating names on old model selector would work

Describe the proposed solution
allow numbers and underscores. removed unused method for name update

[tovbinm]

thank you! lgtm.

[codecov]

Codecov Report

Merging #92 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   86.06%   86.13%   +0.06%     
==========================================
  Files         292      292              
  Lines        9521     9517       -4     
  Branches      336      335       -1     
==========================================
+ Hits         8194     8197       +3     
+ Misses       1327     1320       -7

Impacted Files	Coverage Δ
.../main/scala/com/salesforce/op/stages/package.scala	60% <100%> (+26.66%)	⬆️
...om/salesforce/op/utils/spark/OpSparkListener.scala	98.7% <0%> (+1.29%)	⬆️
...es/src/main/scala/com/salesforce/op/OpParams.scala	89.58% <0%> (+4.16%)	⬆️

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[salesforce-cla]

Thanks for the contribution! Unfortunately we can't verify the commit author(s): leahmcguire <l***@s***.com>. One possible solution is to add that email to your GitHub account. Alternatively you can change your commits to another email and force push the change. After getting your commits associated with your GitHub account, refresh the status of this Pull Request.