selftests/bpf: Convert test_hashmap into test_progs test

Fold stand-alone test_hashmap test into test_progs.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429012111.277390-4-andriin@fb.com

tools/testing/selftests/bpf/.gitignore

@@ -30,8 +30,6 @@ test_tcpnotify_user
 test_libbpf
 test_tcp_check_syncookie_user
 test_sysctl
-test_hashmap
-test_btf_dump
 test_current_pid_tgid_new_ns
 xdping
 test_cpp

tools/testing/selftests/bpf/Makefile

@@ -33,7 +33,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
 	test_align test_verifier_log test_dev_cgroup test_tcpbpf_user \
 	test_sock test_btf test_sockmap get_cgroup_id_user test_socket_cookie \
 	test_cgroup_storage \
-	test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap \
+	test_netcnt test_tcpnotify_user test_sock_fields test_sysctl \
 	test_progs-no_alu32 \
 	test_current_pid_tgid_new_ns