sysctl: restore old -p handling

sysctl: restore old -p handling

The previous version of sysctl had the form:
	sysctl -p [file]
In other words, it required a space between the -p and the [file].
Omitting the space would lead to an error.

The new version though is the opposite:
	sysctl -p[file]
In other words, it requires there to not be a space.

Considering the old behavior has been around for a decade, and runtime
checking for this mismatch in behavior is silly, and supporting the old
syntax is trivial, add support for it.

When '-p regexp' is glob is used to make reqular expression to be
expanded to argument list, which also means that -p option will
allow multiple files being specified as input.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>