user/lxc: update to 6.0.3 and fix lxc-create template scripts

[BarryLhm]

Checklist

Before this pull request is reviewed, certain conditions must be met.

The following must be true for all changes:

• I have read CONTRIBUTING.md

The following must be true for template/package changes:

• I have read Packaging.md
• I have built and tested my changes on my machine

The following must be true for new package submissions:

• I will take responsibility for my template and keep it up to date

[BarryLhm]

Closes #3374

[q66]

you don't need gsed, the problem is that -i requires an argument, so changing sed -i '...' to sed -i '' '...' should be enough

[BarryLhm]

@q66 the sed patterns are also incompatible with bsd sed, but I don't know how to fix it.
using gsed is a temporary solution.

[q66]

the getopt switch is okay, nothing else you can really do

[BarryLhm]

sed: 1: "d}
": extra characters at the end of d command

[JamiKettunen]

the patterns are (or should be anyway, specify the exact command which doesn't work if not) compatible with FreeBSD sed, literally just replace -i with -i '' and it'll work at the cost of making them incompatible with gsed (not that this matters to us)

[BarryLhm]

or should be anyway, specify the exact command which doesn't

source/templates/lxc-download.in
(generates /usr/share/lxc/templates/lxc-download)
in line 416, 419:
sed -i '' -e "/lxc.net.0/{w ${LXC_PATH}/config-network" -e "d}" "${LXC_PATH}/config"
sed -i '' -e "/lxc./{w ${LXC_PATH}/config-auto" -e "d}" "${LXC_PATH}/config"

still don't work

[q66]

indeed, specifically the 'd}' is problematic (without the 'd' it works, but then it does not delete the lines from the original file)

i'm not sure if there is a standard equivalent, i need to look into it