[SPARK-3848] yarn alpha doesn't build on master

[sarutak]

yarn alpha build was broken by #2432
as it added an argument to YarnAllocator but not to yarn/alpha YarnAllocationHandler
commit 79e45c9

[SparkQA]

QA tests have started for PR 2715 at commit bafb8d1.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2715 at commit bafb8d1.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/21466/Test PASSed.

[tgravescs]

thanks @sarutak! changes look good.