[LTP] [PATCH v2] syscalls/setregid02: Fix retrieving a group of user "nobody"

[Yuriy Kolerov]

In setup this test sets UID and GID of the user "nobody". Then
it expects that user "nobody" is in group "nobody" and tries to
retrive a structure for group "nobody" using getgrnam(). However
some Linux distributions use group "nogroup" for user "nobody".
Thus it's necessary to retrieve a group of user "nobody" not by
hardcoded name but by its GID. It's necessary because group
"nobody" may not exist.

I've replaced a variable "nobody" by more generic "ltpgroup".
Then I've created 2 functions get_group_by_name and
get_group_by_gid which are used instead of GET_GID macros.

On my test system I have user "nobody" in group "nogroup". So
I've got this error messages for this test:

    ----------->8----------
    setregid02.c:160: getgrnam("nobody") failed: errno=SUCCESS(0): Success
    setregid02.c:160: Remaining cases broken
    ----------->8----------

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
---
 testcases/kernel/syscalls/setregid/setregid02.c | 53 +++++++++++++++----------
 1 file changed, 32 insertions(+), 21 deletions(-)

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