app/testpmd: replace POSIX-specific code

app/testpmd: replace POSIX-specific code

- Make printf format OS independent
- Replace htons with RTE_BE16
- Replace POSIX specific inet_aton with OS independent inet_pton
- Replace sleep with rte_delay_us_sleep
- Replace random with rte_rand
- #ifndef mman related code for now
- Fix header inclusion
- Include rte_os_shim.h in testpmd.h
- Remove redundant headers

Signed-off-by: Jie Zhou <jizh@linux.microsoft.com>
Acked-by: Tal Shnaiderman <talshn@nvidia.com>
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>