Removed .gitignore

It was a symlink
(../../../../tools/asuite/aidegen/data/gitignore_template), which
caused many git commands (like git status) to issue a warning:

warning: unable to access 'hostsidetests/packagemanager/stats/.gitignore': Too many levels of symbolic links

Bug: 197246371
Test: git status 2>&1| grep warning || echo FIXED

Change-Id: Ib0dff14745ada3acb77da2e4906b29b9fba369eb