Updates .gitignore
Updates .gitignore

To ignore swap files from getting into repository
currently the implemented ignore is *.swp
however vim adds more swap files if these files exists,
so improving this with *.sw?

Change-Id: Ic3e09f8cf0be35c98d89d862d40121a09c7b2498
Closes-Bug: #1255876

JioCloud/python-novaclient,Shihta/python-novaclient,CCI-MOC/python-novaclient,Shihta/python-novaclient,CCI-MOC/python-novaclient,akash1808/python-novaclient,akash1808/python-novaclient,guptaankita/python-novaclient,JioCloud/python-novaclient,takeshineshiro/python-novaclient,metacloud/python-novaclient,takeshineshiro/python-novaclient,guptaankita/python-novaclient,metacloud/python-novaclient,mat128/python-novaclient,mat128/python-novaclient