unittest_ceph_argparse: fix warnings

unittest_ceph_argparse: fix warnings

In file included from test/ceph_argparse.cc:17:0:
../src/gtest/include/gtest/gtest.h: In function ‘testing::AssertionResult testing::internal::CmpHelperEQ(const char*, const char*, const T1&, const T2&) [with T1 = int, T2 = long unsigned int]’:
../src/gtest/include/gtest/gtest.h:1333:30: instantiated from ‘static testing::AssertionResult testing::internal::EqHelper::Compare(const char*, const char*, const T1&, const T2&) [with T1 = int, T2 = long unsigned int]’
test/ceph_argparse.cc:344:207: instantiated from here
warning: ../src/gtest/include/gtest/gtest.h:1263:3: comparison between signed and unsigned integer expressions [-Wsign-compare]

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