RFR: 8261250: Dependencies: Remove unused dependency types

[Vladimir Ivanov]

Remove support of unused dependency types from Dependencies.

Testing: 
- [x] hs-precheckin-comp, hs-tier1, hs-tier2.

-------------

Commit messages:
 - Formatting
 - Formatting cleanups
 - Remove assert_common_3
 - Remove find_exclusive_concrete_subtypes
 - Remove concrete_with_no_concrete_subtype
 - Remove abstract_with_no_concrete_subtype
 - Remove abstract_with_exclusive_concrete_subtype
 - Remove exclusive_concrete_methods

Changes: https://git.openjdk.java.net/jdk/pull/2431/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2431&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261250
  Stats: 253 lines in 2 files changed: 1 ins; 238 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2431.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2431/head:pull/2431

PR: https://git.openjdk.java.net/jdk/pull/2431