lsb.py: strip ' from os-release file

In gentoo the file looks like this:

NAME='Gentoo'
ID='gentoo'
PRETTY_NAME='Gentoo Linux'
VERSION='2.18'
VERSION_ID='2.18'
HOME_URL='https://www.gentoo.org/'
SUPPORT_URL='https://www.gentoo.org/support/'
BUG_REPORT_URL='https://bugs.gentoo.org/'
ANSI_COLOR='1;32'

' were added with:
2f590e35c9

before that the os-release file looked like this:

NAME=Gentoo
ID=gentoo
PRETTY_NAME="Gentoo Linux"
ANSI_COLOR="1;32"
HOME_URL="https://www.gentoo.org/"
SUPPORT_URL="https://www.gentoo.org/support/"
BUG_REPORT_URL="https://bugs.gentoo.org/"
VERSION_ID="2.18"

The ' is stripped from the ID later in distro_identifier with:
    # Filter out any non-alphanumerics and convert to lowercase
    distro_id = re.sub(r'\W', '', distro_id).lower()
but not from version which results in a weird NATIVELSBSTRING like:
    NATIVELSBSTRING      = "gentoo-'2.18'"

And similarly the directory name in sstate-cache:

oe-core $ ls -d sstate-cache/gentoo-*
"sstate-cache/gentoo-'2.18'"   sstate-cache/gentoo-2.18

(From OE-Core rev: 9906255a99f13bf6feefca11e8305364efce6450)

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 55f82653deb1ea8f1304fcba4d588bd55695b616)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

meta/lib/oe/lsb.py

@@ -16,7 +16,7 @@ def get_os_release():
                     key, val = line.rstrip().split('=', 1)
                 except ValueError:
                     continue
-                data[key.strip()] = val.strip('"')
+                data[key.strip()] = val.strip('"\'')
     return data
 
 def release_dict_osr():