install: ignore apt-get update failures on package removal
install: ignore apt-get update failures on package removal

At that point we don't really care.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@inktank.com>

t-miyamae/teuthology,yghannam/teuthology,yghannam/teuthology,caibo2014/teuthology,ivotron/teuthology,ceph/teuthology,robbat2/teuthology,t-miyamae/teuthology,dmick/teuthology,ceph/teuthology,robbat2/teuthology,SUSE/teuthology,zhouyuan/teuthology,dreamhost/teuthology,dmick/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,SUSE/teuthology,zhouyuan/teuthology,SUSE/teuthology,ivotron/teuthology,dmick/teuthology,ktdreyer/teuthology,michaelsevilla/teuthology,caibo2014/teuthology,tchaikov/teuthology,tchaikov/teuthology,dreamhost/teuthology