top on Fedora error about appscope

[michalbiesek]

The #1572 address the issue.

The root cause:

The problematic code resides in _nc_read_entry2 in curses library.

char filename[PATH_MAX]
...

    _nc_SPRINTF(filename, _nc_SLIMIT(PATH_MAX)
		"%.*s", PATH_MAX - 1, name);

The variable name above is set to "xterm".

In the absence of libscope.so, the aforementioned function assigns
the value "xterm" to the filename variable. However, when libscope.so
is loaded, the function assigns "xter" to filename.

In the Fedora environment, the invocation of __sprintf_chk
leads to the execution of __vsprintf_internal:

   va_start (ap, format);
   ret = __vsprintf_internal(s, slen, format, ap, mode);
   va_end (ap);

On the other hand, AppScope utilizes the following call:

   va_start(ap, format);
   rc = vsnprintf(str, strlen, format, ap);
   va_end(ap);

It should be noted that the implementations of vsnprintf and
__vsprintf_internal differ in standard library. This commit replaces
the vsnprintf call with vsprintf to address the discrepancy.

The easiest way to test it is to try to scope top on Fedora.
Integration test was added to cover the issue.