:warning: Update ipxe version

[elfosardo]

This is a tentative to make ipxe more close to the current version and include some improvements and bug fixes. As a first step we build and install ipxe using a commit hash, as no stable versions have been released since December 2020.

We point the ipxe commit hash to [1] from November 2021, so roughly a year of changes is included. To see the complete list of changes run: git log --pretty=oneline 988d2c1..9062544 from a local clone of the ipxe repository.

In general the changes included between the stable 1.21.1 version and the current chosen hash improve compatibility with recent gcc and build libraries, while fixing numerous bugs.

This change also introduce a build arg to allow choosing the ipxe commit hash at container build time.

[1] https://github.com/ipxe/ipxe/commit/9062544f6a0c69c249b90d21a08d05518aafc2ec

[elfosardo]

/test metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[elfosardo]

/test metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[dtantsur]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dtantsur

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[elfosardo]

/test metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[elfosardo]

/test metal3-centos-e2e-integration-test-main metal3-ubuntu-e2e-integration-test-main

[iurygregory]

/lgtm