net/netvsc: fix log format

net/netvsc: fix log format

The PMD_DRV_LOG macro in netvsc (like other drivers) adds a newline to
the log message as part of the macro expansion; therefore the
message should not have its own newline.

In a couple places, log messages were split across source lines
which can make looking them up in the source tree harder.

Fixes: a2a23a794b3a ("net/netvsc: support VF device hot add/remove")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Long Li <longli@microsoft.com>