sap_hana_install: Enhance SAPCAR detection functionality and handling of multiple files

[marcelmamula]

Changes

• Replace existing complex shell commands for SAPCAR OS Architecture detection and identification of latest SAPCAR:
  • Customizable variable dictionary
  • Jinja2 logic with improved readability
  • NOTE: This new structure will be replicated in sap_swpm role where SWPM files need to be identified as well. sap_swpm: Incorrect handling of multiple files with same name #1031
• Added dynamic jinja2 fail messages depending on conditions.
• Added fail check if SAR files were not found.
• Added lot of comments to explain logic behind tasks as well as missing explanations.

Tested

This code change was tested on SLES_SAP 15 SP6 and SLES_SAP 16 RC2.

NOTE for testing: Executing role sap_install_media_detect beforehand will skip SAPCAR and SAR file tasks, because extracted folder is prepared already.

[berndfinger]

I successfully tested the selection of the correct SAPCAR*EXE file on x86_64, ppc64le and s390x managed nodes with all available SAPCAR files, on x86_64 with two different versions and with and without checksum file.

See also my other comments which are part of this review.

[marcelmamula]

@berndfinger All open changes were fixed and I added extra rescue block to remove temporary file __EXTRACTION_ONGOING__.

[berndfinger]

I successfully tested the selection of the correct SAPCAR*EXE file on x86_64, ppc64le and s390x managed nodes with all available SAPCAR files, on x86_64 with two different versions and with and without checksum file.

Thanks for this contribution and also for adding the handling of the status/lock file in case of failures!

LGTM!