Switch some commands to more widely available ones.

The commands `wget` and `awk` are not present in the official Docker
base image for SLE 15 SP6 (registry.suse.com/bci/bci-base:15.6).
Although I guess that the lack of the latter means that this image is
not properly POSIX-compliant, I think the easiest solution is to use
`curl` and `sed` instead, which are available.

See merge request nexedi/slapos.core!655

master/bt5/slapos_web_deploy/PathTemplateItem/web_page_module/deploy_base_setup.txt

@@ -192,7 +192,7 @@ ansible localhost -m pip -a name=slapcache --connection=local
 ansible localhost -m pip -a name=requests --connection=local
 
 if [ ! -f /usr/share/ansible_plugins/mitogen.zip ]; then
-    wget -O /usr/share/ansible_plugins/mitogen.zip https://shacache.nxdcdn.com/3a935ff257ddc0ad4e0f23d71681e026f14f309f4bed0a8e2a217da9b294be2c676196703f0dde856ece49d711d0221deae70812f035b24aa5cdd0ca02790e85
+    curl -o /usr/share/ansible_plugins/mitogen.zip https://shacache.nxdcdn.com/3a935ff257ddc0ad4e0f23d71681e026f14f309f4bed0a8e2a217da9b294be2c676196703f0dde856ece49d711d0221deae70812f035b24aa5cdd0ca02790e85
     unzip /usr/share/ansible_plugins/mitogen.zip -d /usr/share/ansible_plugins/mitogen/
     mv /usr/share/ansible_plugins/mitogen/mitogen-*/* /usr/share/ansible_plugins/mitogen/
 fi

master/bt5/slapos_web_deploy/PathTemplateItem/web_page_module/deploy_function_common.txt

@@ -276,8 +276,8 @@ function GetOSVersion {
             fi
 
             if [[ -n "`grep \"$r\" /etc/os-release`" ]]; then
-                os_CODENAME=$(awk '/VERSION=/' /etc/os-release | sed 's/VERSION=//' | sed 's/\"//g')
-                os_RELEASE=$(awk '/VERSION_ID=/' /etc/os-release | sed 's/VERSION_ID=//' | sed 's/\"//g')
+                os_CODENAME=$(sed -n '/^VERSION=/p' /etc/os-release | sed 's/VERSION=//' | sed 's/\"//g')
+                os_RELEASE=$(sed -n '/^VERSION_ID=/p' /etc/os-release | sed 's/VERSION_ID=//' | sed 's/\"//g')
                 break
             fi
             os_VENDOR=""