Security update for strongswan

This update for strongswan fixes the following issues:

A feature was added:

- Add auth_els plugin to support Marvell FC-SP encryption (jsc#SLE-20151)

Security issues fixed:

- CVE-2021-41991: Fixed an integer overflow when replacing certificates in cache. (bsc#1191435)
- CVE-2021-41990: Fixed an integer Overflow in the gmp Plugin. (bsc#1191367)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Fixed bugs
bnc#1191435
VUL-0: EMBARGOED: CVE-2021-41991: strongswan: Integer Overflow When Replacing Certificates in Cache
bnc#1191367
VUL-0: EMBARGOED: CVE-2021-41990: strongswan: Integer Overflow in gmp Plugin
Selected Binaries
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