fix #34

Removed bash-specific function definitions in genkey test script.

Typo: s/overried/override/

Following error would reported:

root@fedora:# isnsadm -V
isnsadm: invalid option -- 'V'
Error: Unknown option

root@fedora:# isnsadm -r
isnsadm: invalid option -- 'r'
Error: Unknown option

This is because we did not add "V" and "r" to parameter
when calling getopt_long()

Signed-off-by: Wenchao Hao <haowenchao@huawei.com>

isnsadm: Fix unparse command line options "-V" and "-r"

As described in isnsd's manual, if not explictly specified, the isnsd
should listen IPv6 address as default.

Signed-off-by: Wenchao Hao <haowenchao@huawei.com>

isnsd: socket: Make sure to create IPv6 socket default

The file should work even if we decide to start
delivering a shared library.

I'm not sure why they are here,
since nothing uses them.

This just cleans up the output of the output
of 'git status' when libopenisns.so is present.

This allows autotools to still work, but
meson build system is working too, in parallel.

Also, ensure at least one type of library is built,
and use our libisns.ver library versioning file, when
building the shared lib, unless user has diabled that.

This prints a deprecation message when running the script.

Updated a few other small things in the README, but mostly
add info about meson, and mention that autoconf (still explained)
is deprecated.

No real functional change, but features seem better than
true/false options?

Several changes mostly suggested by Eli Schwartz based
on review from github:

- Require at least version 0.54 of meson
- use the "feature" interface correctly for 'slp' and 'security'
- no need to use 'foreach' for several types of installation
  calls, since the calls take a list
- man page installs figure out the subdirectory by themselves
- now using "--default-library={shared,static,both}" instead
  of our "enable_shared" and "enabled_static", letting meson
  figure it out

No need to check options up front. Instead, chcck
them when needed.

Almost completely meson-related, but also found one sentence
that was never finished, so I guessed what is supposed to
go there.

They were both unused parameters. As long as I
was there, I removed spaces at the end of lines, as
well, since they drive me nuts.

Whether using deprecated autotools or meson, use
the version number from the configuration file,
so we don't have to keep it in two places.

Another fix suggested by Eli Schwartz (thanks!).

Migrate to using meson, deprecating autoconf