File status check before fopen

File status check before fopen

Related issue: https://jira.iotivity.org/browse/IOT-1047

Change-Id: I83b82980b122e1336b18e4c864cf8bc3826abb6d
Signed-off-by: Dmitriy Zhuravlev <d.zhuravlev@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/7491
Reviewed-by: Oleksandr Dmytrenko <o.dmytrenko@samsung.com>
Reviewed-by: Ivan Pazderskyy <i.pazderskyy@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jongsung Lee <js126.lee@samsung.com>
Reviewed-by: Kyungsun Cho <goodsun.cho@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>