[crac] RFR: 8348869: [CRaC] Restore args are split by whitespaces incorrectly [v2]

[Timofei Pushkin]

> Fixes the issue by creating a new property `sun.java.crac_command` with spaces escaped. On restore, JVM parses this string de-escaping symbols.
> 
> Replaces abandoned #101.

Timofei Pushkin has updated the pull request incrementally with one additional commit since the last revision:

  Use StringBuffer to parse new restore args

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Changes:
  - all: https://git.openjdk.org/crac/pull/193/files
  - new: https://git.openjdk.org/crac/pull/193/files/fbcf2986..cadaa8bb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=193&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=193&range=00-01

  Stats: 12 lines in 1 file changed: 1 ins; 3 del; 8 mod
  Patch: https://git.openjdk.org/crac/pull/193.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/193/head:pull/193

PR: https://git.openjdk.org/crac/pull/193