[MRG+1] Fix test of SingleInheritanceEstimator to not raise DeprecationWarning (#8526)
[MRG+1] Fix test of SingleInheritanceEstimator to not raise DeprecationWarning (#8526)

* Fix test of SingleInheritanceEstimator to not raise DeprecationWarning

* [MRG+1] Fix test of SingleInheritanceEstimator to not raise DeprecationWarning (#8526)

Fix: test of SingleInheritanceEstimator to not raise DeprecationWarning (#8526)

- Ignore a DeprecationWarning about unpickling an estimator from a different version

* [MRG+2] Fix test of SingleInheritanceEstimator to not raise DeprecationWarning (#8526)

Fix: test of SingleInheritanceEstimator to not raise DeprecationWarning (#8526)

  - Test of SingleInheritanceEstimator would raise UserWarning, not DeprecationWarning
  - Ignore a UserWarning about unpickling an estimator from a different version

betatim/scikit-learn,amueller/scikit-learn,jakirkham/scikit-learn,sergeyf/scikit-learn,vortex-ape/scikit-learn,xuewei4d/scikit-learn,bthirion/scikit-learn,shyamalschandra/scikit-learn,ndingwall/scikit-learn,amueller/scikit-learn,jakirkham/scikit-learn,herilalaina/scikit-learn,kevin-intel/scikit-learn,BiaDarkia/scikit-learn,ivannz/scikit-learn,wlamond/scikit-learn,kevin-intel/scikit-learn,vinayak-mehta/scikit-learn,herilalaina/scikit-learn,Titan-C/scikit-learn,ogrisel/scikit-learn,anntzer/scikit-learn,sergeyf/scikit-learn,wazeerzulfikar/scikit-learn,betatim/scikit-learn,themrmax/scikit-learn,vinayak-mehta/scikit-learn,saiwing-yeung/scikit-learn,nhejazi/scikit-learn,Vimos/scikit-learn,manhhomienbienthuy/scikit-learn,bnaul/scikit-learn,joernhees/scikit-learn,anntzer/scikit-learn,zorroblue/scikit-learn,rvraghav93/scikit-learn,Titan-C/scikit-learn,MechCoder/scikit-learn,joernhees/scikit-learn,bthirion/scikit-learn,chrsrds/scikit-learn,TomDLT/scikit-learn,AlexandreAbraham/scikit-learn,joernhees/scikit-learn,glemaitre/scikit-learn,ldirer/scikit-learn,vortex-ape/scikit-learn,jakirkham/scikit-learn,ogrisel/scikit-learn,hlin117/scikit-learn,huzq/scikit-learn,wazeerzulfikar/scikit-learn,wlamond/scikit-learn,kevin-intel/scikit-learn,saiwing-yeung/scikit-learn,amueller/scikit-learn,hlin117/scikit-learn,espg/scikit-learn,amueller/scikit-learn,TomDLT/scikit-learn,scikit-learn/scikit-learn,aflaxman/scikit-learn,ivannz/scikit-learn,ndingwall/scikit-learn,BiaDarkia/scikit-learn,clemkoa/scikit-learn,nikitasingh981/scikit-learn,RomainBrault/scikit-learn,anntzer/scikit-learn,MechCoder/scikit-learn,rvraghav93/scikit-learn,scikit-learn/scikit-learn,RomainBrault/scikit-learn,hlin117/scikit-learn,lesteve/scikit-learn,jakobworldpeace/scikit-learn,AlexandreAbraham/scikit-learn,chrsrds/scikit-learn,huzq/scikit-learn,scikit-learn/scikit-learn,nhejazi/scikit-learn,saiwing-yeung/scikit-learn,glemaitre/scikit-learn,betatim/scikit-learn,huzq/scikit-learn,scikit-learn/scikit-learn,zorroblue/scikit-learn,aflaxman/scikit-learn,shyamalschandra/scikit-learn,mikebenfield/scikit-learn,lesteve/scikit-learn,ogrisel/scikit-learn,nikitasingh981/scikit-learn,jakobworldpeace/scikit-learn,nhejazi/scikit-learn,ldirer/scikit-learn,clemkoa/scikit-learn,clemkoa/scikit-learn,xuewei4d/scikit-learn,joernhees/scikit-learn,btabibian/scikit-learn,RomainBrault/scikit-learn,bthirion/scikit-learn,bnaul/scikit-learn,Vimos/scikit-learn,kevin-intel/scikit-learn,raghavrv/scikit-learn,MechCoder/scikit-learn,ndingwall/scikit-learn,BiaDarkia/scikit-learn,lesteve/scikit-learn,hlin117/scikit-learn,bnaul/scikit-learn,herilalaina/scikit-learn,sergeyf/scikit-learn,ldirer/scikit-learn,bnaul/scikit-learn,manhhomienbienthuy/scikit-learn,btabibian/scikit-learn,herilalaina/scikit-learn,Titan-C/scikit-learn,raghavrv/scikit-learn,shyamalschandra/scikit-learn,rvraghav93/scikit-learn,espg/scikit-learn,ivannz/scikit-learn,zorroblue/scikit-learn,vinayak-mehta/scikit-learn,aflaxman/scikit-learn,AlexandreAbraham/scikit-learn,ogrisel/scikit-learn,themrmax/scikit-learn,AlexandreAbraham/scikit-learn,chrsrds/scikit-learn,TomDLT/scikit-learn,raghavrv/scikit-learn,rvraghav93/scikit-learn,wlamond/scikit-learn,BiaDarkia/scikit-learn,sergeyf/scikit-learn,xuewei4d/scikit-learn,ndingwall/scikit-learn,betatim/scikit-learn,MechCoder/scikit-learn,glemaitre/scikit-learn,btabibian/scikit-learn,wlamond/scikit-learn,anntzer/scikit-learn,Vimos/scikit-learn,saiwing-yeung/scikit-learn,nhejazi/scikit-learn,raghavrv/scikit-learn,nikitasingh981/scikit-learn,nikitasingh981/scikit-learn,btabibian/scikit-learn,mikebenfield/scikit-learn,wazeerzulfikar/scikit-learn,chrsrds/scikit-learn,themrmax/scikit-learn,glemaitre/scikit-learn,RomainBrault/scikit-learn,manhhomienbienthuy/scikit-learn,espg/scikit-learn,clemkoa/scikit-learn,shyamalschandra/scikit-learn,jakirkham/scikit-learn,mikebenfield/scikit-learn,themrmax/scikit-learn,jakobworldpeace/scikit-learn,xuewei4d/scikit-learn,zorroblue/scikit-learn,ldirer/scikit-learn,espg/scikit-learn,wazeerzulfikar/scikit-learn,ivannz/scikit-learn,manhhomienbienthuy/scikit-learn,TomDLT/scikit-learn,huzq/scikit-learn,mikebenfield/scikit-learn,Vimos/scikit-learn,lesteve/scikit-learn,aflaxman/scikit-learn,vinayak-mehta/scikit-learn,bthirion/scikit-learn,vortex-ape/scikit-learn,Titan-C/scikit-learn,vortex-ape/scikit-learn,jakobworldpeace/scikit-learn