Add Try node

[cdce8p]

Description

Depends on #1388

In the Python AST TryExcept and TryFinally have long been replaced by Try. This PR adds a new Try node to do the same in astroid.

To test this change in pylint, add this in pylinter.py (after the imports).

from astroid.manager import AstroidManager
AstroidManager.tree_rev = 2

Type of Changes

	Type
✓	✨ New feature

[coveralls]

Pull Request Test Coverage Report for Build 3403718144

• 64 of 73 (87.67%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 92.238%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
astroid/rebuilder.py	14	18	77.78%
astroid/nodes/node_classes.py	50	55	90.91%

Files with Coverage Reduction	New Missed Lines	%
astroid/rebuilder.py	1	96.31%

Totals
Change from base Build 3393053917:	-0.04%
Covered Lines:	9922
Relevant Lines:	10757

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💛 - Coveralls

[cdce8p]

Superseded by #1867