util: make capacity a public attribute on lrucachedict
So others can query it. Useful for operations that may want to verify
the cache has capacity for N items before it performs an operation that
may cause cache eviction.
Differential Revision: https://phab.mercurial-scm.org/D4499
#require execbit
$ hg init repo
$ cd repo
$ echo foo > foo
$ chmod 644 foo
$ hg ci -qAm '644'
$ chmod 755 foo
$ hg ci -qAm '755'
reverting to rev 0
$ hg revert -a -r 0
reverting foo
$ hg st
M foo
$ hg diff --git
diff --git a/foo b/foo
old mode 100755
new mode 100644
$ cd ..